Mary said she had been working for two hours,————obviously,w

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Mary said she had been working for two hours,————obviously,was not the truth
A：that B：what C：it D：which 为什么选D不选C
2、He lost his way and then,——matters worse,it began to rain
A：made B：having made C：making D：to make
为什么选D
3、He passed away last year,——his wife and two children.
A：leaving B：to leave C：left D：leave
为什么选A不选C

1.
Mary said she had been working for two hours,which obviously,was not the truth.
which 是指前面那句 "Mary说她连续工作两小时".
relative pronouns 和 relative clauses 的用途和用法应该不用解析吧.
再来一句例句:I'm trying to tell you the answer,which clearly,is not a waste of time.
你要用 it 的话,应改这样写:Mary said she had been working for two hours,and obviously,it was not the truth.
I'm trying to tell you the answer,and that is clearly not a waste of time.
2.
不是 imperatives 所以不会是动词开头,A.
to-infinitive有 "一次性" 的意思,而gerund则带有 "每次都是" 的意思.句子中的 "he" 才一次那麼不幸吧.所以撇除B和C,剩下D.
3.
He passed away last year,leaving his wife and two children.
这句是考你对 gerund 的认识.
再提供一些类似的句型:
There was an explosion in the factory,leading to the death of 101 people.
He made a silly face in front of the teacher,making all the students laugh.
你要用 left 的话,只能用 passive voice 说成 his wife and two children were left behind.

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