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【题目】 —Can you help me, Mom? Todays homework is difficult. I dont know __________________ to solve it.

—OK, Im coming.

A. how B. what C. where D. when

【答案】A

【解析】句意:——妈妈,你能帮帮我吗?今天的作业很难,我不知道怎么做——好的,我这就来。表示如何用how。根据句意可知选A。

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