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问题: I’ve worked with children before, so I know what ___ in my new job.

I’ve worked with children before, so I know what ___ in my new job.
A. to expect
B. expected
C. to be expecting
What 后面不是可以跟分词吗,为什么这里B 不用,而用A?

解答:

答案是A. what/how 等后面只跟不定式.此结构为宾语从句的省略形式.当宾语从句的谓语动词是want to do sth 或should do sth 时,而宾语从句的主语又是主句的主语时,可将宾语从句省略成what/which/who...to do,(此形式中do与what等是动宾形式,但不用to be done 形式)或how/where/why...to do sth.如:1.I don't know which I want to choose.==I don't know which to choose.2. John wonders where he should go==John wonders where she to go.但下面一句不可省:I am wondering why he wants to run away.知道为何吗?