问题
选择题
_______ how to do the homework, I went to ask my teacher for help.
A．Not to know
B．Not knowing
C．Knowing not
D．Not known
答案
答案：B
考察非谓语动词.句意:不知道如何做作业,我去问我的老师寻求帮助.现在分词表示主语正在进行的伴随性动作,和句子主语是主谓关系,结合语境可知选B.
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