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【题目】One fifth of the work _______ by computer last year.

A. are done B. is done C. were done D. was done

【答案】D

【解析】根据last year确定句子为过去时,由此排除A和B项;当主语由分数修饰时,谓语动词的数要跟其修饰的主要名词在量上一致,work为不可数名词,因此谓语动词为is。

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