英语语法真正高手请进have worked with children before , so I know what

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英语语法真正高手请进
have worked with children before , so I know what _____ in my new job.
A, to expect B, to be expecting C, expected D, expects
这道题目请用排除法一一进行分析
我知道选择A 那么CD 为何又不行 ?I 主语 know宾语【宾语从句what+谓语.】
不能这样理解吗?
求详细分析

本题选A.
应该选择表示将来的意思的非谓语形式.
为什么要说非谓语形式呢,因为句子中已经有了一个know了,通过判断这不是一个宾语从句,因此后面不能再出现动词了.
本题实际上是考察 “疑问词+不定式”这种结构,它相当于一个名词,在句子中可以做除了谓语以外的任何成分,因此是 what to expect. “我应该期待什么”,作know的宾语.
懂了没吗?
再问：通过判断这不是一个宾语从句通过判断? 这一点您似乎没咋讲我怎么懂您是通过什么依据来判断的呢？
再答：因为没有主语啊，如果用what 作主语的话，C D都不成立啊。

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