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【题目】It has been three years ______________I left school.

A.sinceB.asC.whileD.before

【答案】A

【解析】

句意:自从我离开学校已经有三年了。

考查从属连词词义辨析。since自从;as由于;while当……时;before在……之前。根据句意可知,是自从离开学校已经三年了,“since +一般过去时”结构通常和现在完成时搭配。故选A

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