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【题目】 How long ________ it since he left his school?

He ________ for three years.

A.has been; has leftB.is; has been awayC.was; has left

【答案】B

【解析】

句意:——他离开学校多久了?——他离开三年了。

考查时态。since自从,引导的时间状语从句,主句用现在完成时,如果主句主语为it,则还可以用一般现在时,故C选项错误;for+一段时间,用现在完成时,而且动词时态必须为延续性动词,故选B

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