Was it in 1998, when he was still at a middle school, this boy became an expert at compute——青夏教育精英家教网—

摘要： Was it in 1998, when he was still at a middle school, this boy became an expert at computer? A. which B. when C. where D. that

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Was it in 1998, when he was still at middle school, ______ this boy became expert at computer?

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Was it in 1998, when he was still at middle school, ________ this boy became an expert at computer?

A．which

B．where

C．when

D．that

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