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【题目】— Could you help me to solve this problem?

—Wait a moment, please. I ________ a letter to my boss. I'll help you later.

A.have writtenB.am writingC.wroteD.was writing

【答案】B

【解析】

句意:——你能帮我解决这个问题吗?——请稍等。我正在给老板写信。以后我会帮你的。

考查时态。have written 现在完成时态形式;am writing现在进行时态形式;wrote动词的过去式;was writing现在进行时态形式。根据前面Wait a moment, please和下句I'll help you later可知,此空应填现在进行时态形式,故填am writing,故选B

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