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以下有几道不会的题目,急求解释原因(附带答案)

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以下有几道不会的题目,急求解释原因(附带答案)
it is certain that the day will come when Taiwan_______to our motherland  
A.returns    B.will return    C.return    D.returning
2.The day we had been looking forward to _______ at last.
 A.came     B.coming      C.will come     D.comes
3.— _________the books ____well? 
 — Yes,they have all been sold out.
A.Are,sold      B.Were,sold      C.Do,sell      D.Are,being sold
4.Xiao Wang ______back home last night.He _______in Beijing for five years since he______Shanghai.
A.came ,had lived ,left         B.came,has lived,left             C.came,lived,was leaving          D.came,has been living,left  
5.They ______the problem for two days but no agreement_________.
A.having been discussing,has been reached                 B.have dicussed,has reached
C.discussed,reached                                                      D.were discussing,reached
6. The museum he paid a visit to ______at the end of the street.
A.stand           B.stands            C.standing               D.stood
6. The museum he paid a visit to ______at the end of the street.
A.stand           B.stands            C.standing               D.stood
7.We all want to see you again,and we'll be very disappointed if you ______.
A.didn't come       B.don't come          C.won't come            D.hadn't come
1.B   2.A  3.C. 4.A   5.A   6.B  7.A   
以下有几道不会的题目,急求解释原因(附带答案)
B.the day when Taiwan will return to our motherland.是定语从句,不是时间状语从句
A.the day we had.是主语部分,we had...是定语从句,came 是谓语.的日子终于来了.事情已经发生,come用过去时.
C.好买,好卖,好写,耐穿等这些意思时,用主动.不用被动.
A.昨天晚上回来,用过去时,那后面的动作是发生在昨天晚上之前,所以用过去完成时.
A.应该是have been discussing ,完成进行时,讨论了两天,强调动作从过去一直持续到现在,还有可能继续下去,后一个空,到目前为止还没有达成一致,用现在完成时的被动语态.
C.主语是the musuem he paid a visit to,是单数第三人称,he paid a visit to是定语从句,谓语stand要加s.
B.答案用B更好些.前面表示的大家都想再次见到你,动作还没发生.我们将失望,如果你不来的话,表示将来的事,if 引导条件,假设不来的话,if不是引导宾语从句,所以用一般时表示将来.
再问: 第三题为什么不能用Are 提问?
再答: 前面已经讲了,这种情况不用被动语态,所以,也就不用be动词了。卖完了,就用被动。 如: This kind of silk handkerchiefs sell well in the Western market. 这种丝制手帕在西方市场销路很好。 A good book does not necessarily sell well. 好书未必畅销。 My pencil doesn't write well; I must sharpen it. 我的铅笔不好使;我必须把它削尖。 The pens produced in this factory write well. 这家工厂生产的钢笔写起来流畅。 但是,如果说某事某文章写在哪里或写好了,就用被动。 The letter was written on a single sheet of paper.这封信只用一张纸写成。 The message was written in pencil.这信是用铅笔写的。 The houses are sold out within this price range.在这个价位范围之内的房子已售完。
再问: 谢谢你!我明白了
再答: 第6题的答案输入错了,应该是你给的B。 后面的解释没错。题干是: The museum stands at the end of the street.
再问: 嗯