Question

【题目】The letters for the boss on his desk but he didn't read them until three days later.
A.were put
B.had put
C.would put
D.have put

Answer 1

【答案】A
【解析】句意为：给老板的那些信被放在了桌子上，但直到三天后他才读的。根据but后的“didn’t read”可知老板读信是发生在过去，所以信被放到桌子上应该发生在“读信”之前，也是过去的动作，与现在无关，所以排除D项；the letters与put之间为被动关系，故排除C项；而且the letters作主语，是复数，可排除B项。所以答案为A项。