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 workedC．will have been workingD．had worked
A

試題分析：考查時態(tài)：句意：我不會告訴學(xué)生數(shù)學(xué)題目的答案，直到他算了一個多小時。首先，由于until引導(dǎo)的是時間狀語從句，根據(jù)“主將從現(xiàn)”原則，當(dāng)主句為將來時態(tài)時，時間狀語從句不能直接用將來時態(tài)來表示將來意義，據(jù)此可排除B和C；而選項D為過去完成時，也不能選，因為“過去完成時”必須以“過去”為支點，表示“過去的過去”，但此句并沒有過去時態(tài)這一支點，故此選項也被排除，這里用現(xiàn)在完成進(jìn)行時代替將來完成進(jìn)行時，選A。
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