【题目】Grandpa __________ use computers when he was at school. ( )
A.can’tB.couldn’tC.wasn’t
【答案】B
【解析】
句意：爷爷在学校的时候不会游电脑。wasn’t后面不能跟动词原形，句中was 说明要用一般过去时，A不符合，B符合，故选B。
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