1.only after we left the building______how dangerous the sit

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1.only after we left the building______how dangerous the situation had been
A.was I realized B.I realized C.did I realize D.I was realized
为啥选c?
2.The company needs a secretary,_______that can operate the computer quite well.
A.one B.he C.it D.who
为啥选A?不选D?

第一题,only引导的状语从句放在句首时,后面的主句必须采取倒装形式.由此可以排除B、D.因为realize是一个实意动词,所以要借助助动词did,而不能用be动词was.
第二题：在这里,很可能把此句看成一个非限制性定语从句修饰secretary,就容易选成who,但如果选D,那么这里就不必再要that,因为who本身在从句句中做了主语了.因此不能选D.所以就选择A中的one充当secretary的同位语,和that的先行词,that引导的是一个限制性定语从句.

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