Was it in 1998,when he was still at middle school, this boy became expert at computer? A.whic——青夏教育精英家教网—

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