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

A

【解析】

試題分析:考查動(dòng)詞時(shí)態(tài)。句意:我直到他已經(jīng)做這道數(shù)學(xué)題超過(guò)一個(gè)小時(shí)才告訴學(xué)生們數(shù)學(xué)答案。根據(jù)“for more than an horn!敝x用現(xiàn)在完成進(jìn)行時(shí)態(tài)。

考點(diǎn) : 考查動(dòng)詞時(shí)態(tài)

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