【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，但他直到三天后才讀。根據(jù)語境及but分句的時(shí)態(tài)可知第一個(gè)分句也應(yīng)該用過去時(shí)，故排除D項(xiàng)；又因?yàn)?/span>letters同put之間為被動(dòng)關(guān)系，故排除C項(xiàng)。根據(jù)主語letters為可數(shù)名詞復(fù)數(shù)可知B項(xiàng)不正確，所以選A項(xiàng)。

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