When the boy couldn't find his mother,he didn't know
A．what to do B．how to do C．what to do it D．how to do it 要有解析
人气：274 ℃ 时间：2019-10-17 02:51:29
解答
正选A
b中how to do ,do没有宾语 how 不能做宾语
c中 what to do it ,do的宾语重复 it 和what
d中 how to do it ,怎样做这件事 语义不通
重点 do 是及物动词
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