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题目内容
（齐齐哈尔大学- 大学英语）
My wallet is nowhere to be found.I_____it when I was on the bus.
（2.0分）
2.0 分
A、
must drop
B、
should have dropped
C、
had dropped
D、
must have dropped
（2.0分）
2.0 分
A、
must drop
B、
should have dropped
C、
had dropped
D、
must have dropped
参考答案