【題目】— 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：——你能幫我解決這個問題嗎？——請稍等。我正在給老板寫信。以后我會幫你的。

考查時態(tài)。have written 現(xiàn)在完成時態(tài)形式；am writing現(xiàn)在進(jìn)行時態(tài)形式；wrote動詞的過去式；was writing現(xiàn)在進(jìn)行時態(tài)形式。根據(jù)前面Wait a moment, please和下句I'll help you later可知，此空應(yīng)填現(xiàn)在進(jìn)行時態(tài)形式，故填am writing，故選B。

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