选B.
A选项 去掉it;C选项和D选项 要在最后加it
The boy didn't know___.A：what to do it B：what to do C：when to do D：how to do
The boy didn't know___.A：what to do it B：what to do C：when to do D：how to do
英语人气：281 ℃时间：2019-08-22 15:48:34
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