【題目】I won’t tell the student the answer to the math problem until he on it for more than an hour.

A. has been working B. will have worked

C. will have been working D. had worked

【答案】A

【解析】

試題分析： 考查動詞時(shí)態(tài)。句意：我直到他已經(jīng)做這道數(shù)學(xué)題超過一個(gè)小時(shí)才告訴這個(gè)學(xué)生數(shù)學(xué)答案。根據(jù)“for more than an horn。”知選用現(xiàn)在完成進(jìn)行時(shí)態(tài)。

考點(diǎn) : 考查動詞時(shí)態(tài)

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