【題目】 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:——他離開學(xué)校多久了?——他離開三年了。

考查時態(tài)。since自從,引導(dǎo)的時間狀語從句,主句用現(xiàn)在完成時,如果主句主語為it,則還可以用一般現(xiàn)在時,故C選項錯誤;for+一段時間,用現(xiàn)在完成時,而且動詞時態(tài)必須為延續(xù)性動詞,故選B

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