1.It's our duty _______ the environment

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1.It's our duty _______ the environment
A.protect
B.to protect
C.protects
D.protecting
2.---________ my dictionary?
---Yes,I ________ it on your desk just now.
A.Do you see,have seen
B.Have you seen,saw
C.Will you see,will see
D.Did you see,have seen
3.---I went swimming last Sunday.
---________.I like it very much.
A.So I do
B.So I did
C.So do I
D.So did I
4.__________ everyone played well,________ we lost the game.
A.Although,but
B.Although,/
C.Although,and
D.Although,then
要说出原因

第一题B
AC在句子里面没有适当的结构.这句话其实是一个形式主语结构,也就是说to protect xxx才是主语,这样看protect和protects都没有名词属性是不行的.to 表示目的,总得来说,it's our responsibility/duty/job这种的形式主语固定都是用to do 的
第二题B
先从第二空看,just now是一个一般过去时的关键词（这是一个具体的时间点,而这个事件发生在那个时间点上,但现在完成式是延续的,不能确定到某个过去时间点上）,放弃AD
既然都说了是一般过去时,那么C是将来时,说不通,选B
第三题D
首先确立了时间是last summer,那么一定是过去式,AC排除
so do sb是指某人也做了这个事情,而so sb/sth do 是肯定强调,比如
-It's a wonderful film
-So it is ←这句就是说它确实是这样的,强调而已
这个人是说我也去游了,那么就选B
选B
although是转折关系,就算是从关系上来说CD都不对,更何况though although后面的分句是不能跟连接词的,也就是说but,and都不能跟（例外的是yet,可以跟yet）
所以选B

1.It's our duty _______ the environment it's our duty to help ____(protect)the environment it's our duty to protect our environment/是什么意思请问 It is our duty to protect the environment it is our duty to protect the environment. I think it's our duty to keep our environment clean and tidy 我们有责任不污染环境It's our duty ()()()our environment It's our duty to ____ _____ _______（保护环境） Protecting the environment is our duty. To pretect the environment is our duty We ought to protect environment. It's our duty to do that. 翻 to,is,our,it,duty,protect,environment,the,连词成句