【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 workingB. will have worked

C. will have been workingD. had worked

【答案】A

【解析】

試題 考查動詞時態(tài)。句意:我直到他已經(jīng)做這道數(shù)學(xué)題超過一個小時才告訴這個學(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)行時態(tài)。

考點(diǎn) : 考查動詞時態(tài)

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