问题
选择题
The letters for the boss ______ on his desk but he didn’t read them until three days later.
A．was put
B．put
C．has put
D．were put
答案
D
题目分析：考查被动语态。本句的主语是the letters，与动词put构成被动关系，故使用过去分词的形式。句意：给老板的信被放在桌子上，但是知道3天以后他才看见。故D正确。
点评：被动语态的考查主要要与句子的语义串联在一起，要注意语法的统一。