【題目】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】根據(jù)last year確定句子為過去時(shí)，由此排除A和B項(xiàng)；當(dāng)主語由分?jǐn)?shù)修飾時(shí)，謂語動(dòng)詞的數(shù)要跟其修飾的主要名詞在量上一致，work為不可數(shù)名詞，因此謂語動(dòng)詞為is。

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