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请英语高手来帮我下这几个中学的选择题~

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请英语高手来帮我下这几个中学的选择题~
1.-I haven`t heard from Dick for long.
-What do you suppose ___to him.
a.having happened b.has happened c.to have happened
d.happening
为什么选B?
2.You can always depend upon___when he is needed.
a.John to be there b.John`s being there c.there to be
John d.there being John
为什么是A,不是D?
3.when I passes through the woods,the hunter happened ___a
trap___a tiger.
a.to be laying,to catch b.to lay,for catching c.to lay
,as to catch d.to be laying,for chaching
为什么是a?
4.he returned home____his father ___sick in bed.
a.finding,lying b.to have found,laid c.to find,lying
d.to be finding,lain
为什么是c?
5.in the woods there were safe roads for strangers____.
a.driving their cars along b.driving thear cars c.to
drive their cars d.to drive their cars along
这里为什么是d,不是c?后面多加了一个along有什么关系吗?
6.when I handed the record to John,he said that George was
the person____.
a.to send b.for sending it c.to send it to d.for
sending it to
这里为什么是c,不是d呢?
请英语高手来帮我下这几个中学的选择题~
1、答案应该是A,因为在猜想之前,事情已经发生了,动名词和完成时一致,一个单句不能出现两个谓语动词,选了B,就出现了两个动词,所以B答案是错的.
2、因为upon是介词,要跟名词John作宾语,而D答案中的there是副词,不能作宾语,只能做地点状语,所以不是D,是A
3、因为hapen是不及物动词,不能跟宾语trap,只有搭配介词to才能跟宾语.
4、因为find这个动作发生在return之后,只有不定式和将来时一致,表示一前一后的动作,所以选C
5、因为不加along不知道路的方向,along是沿着这条路走的意思,所以是D.
6、 因为这要用不定式作定语,而介词结构只能作状语,不能作定语,所以选C.