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She didn't know________.A.what she could do it

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She didn't know________.A.what she could do it
B.what to do it
C.what she can do
D.how to do it
She didn't know________.A.what she could do it
选择D吧 她不知道怎样做(它).
一般这一类的是这么记的.she did't know what to do .do 后面没有宾语it 那么用what.其实what就是do的宾语.(她不知道做什么).
还有一种是就是这个选择she didn't how to do it.do后面有宾语it,就选择how表示方式,怎么做的意思.(她不知道怎么做这件事)
另外 what to do 和how to do 都是疑问词+to do (动词不定式)的一个用法.