【題目】The company had about 20 notebook computers but only one-third used regularly. Now we have 60 working all day long.

A. is

B. are

C. was

D. were

【答案】D

【解析】當(dāng)分數(shù)、百分數(shù)作主語時, 要根據(jù)其后面的名詞來決定其謂語動詞的單復(fù)數(shù)。此處one-third應(yīng)是one-third of the notebook computers的省略形式, 因此謂語動詞用復(fù)數(shù), 且句子的時態(tài)用了過去時, 所以D項正確。

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