The letters for the boss ______ on his desk but he didn’t read them until three days later.
A．was putB．putC．has put D．were put
D

試題分析：考查被動語態(tài)。本句的主語是the letters，與動詞put構(gòu)成被動關系，故使用過去分詞的形式。句意：給老板的信被放在桌子上，但是知道3天以后他才看見。故D正確。
點評：被動語態(tài)的考查主要要與句子的語義串聯(lián)在一起，要注意語法的統(tǒng)一。
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