【题目】________ how to do the homework, I went to ask my teacher for help.
A. Not knownB. Not knowing
C. Not knowD. Not being known
在线课程【答案】B
【解析】
试题分析：考查非谓语动词。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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