【題目】The letters for the boss __________ on his desk but he didn't read them until three days later.

A. were put B. was put

C. put D. has put

【答案】A

【解析】句意:給老板的信放在他的桌子上,但他三天后才讀。根據(jù)語境及but分句的時態(tài)可知前半句也應(yīng)該用過去時，故排除D項;又因為letters和 put之間為被動關(guān)系,故排除C項。根據(jù)主語letters為可數(shù)名詞復(fù)數(shù)可知B項不正確,所以選A項。

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