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she doesn't know_____and asks us for help.A.what she can do

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she doesn't know_____and asks us for help.A.what she can do it B.what to do it C.how to do D.how to do it
麻烦各位亲帮我讲一下这四个选项的区别,最好可以后天大考了,
she doesn't know_____and asks us for help.A.what she can do
答案很明显选D,这种题我做过不下千遍
【解析】
A选项,应该是what she can do,即把it去掉.其中what 是句子中的宾语,只是句子倒装了,可以把它理解为she can do what,若是加上it,变成she can do what it,明显错误.
B选项,应该是what to do.你只要记住what to do(注意后面没it)跟how to do it(后面有it)这两个固定搭配就好,不必深究太多,死记这两个东西,以后还会见到的.
C选项,参考B选项
D选项,正确答案
楼主只要牢记what to do跟how to do it,搞清楚哪个要加it,这种题目以后就可以游刃有余了