2. 外语
  3. My wallet is nowhere to be found. I ______ when I was on the bus.

My wallet is nowhere to be found. I ______ when I was on the bus.

admin2008-11-13  47
问题 My wallet is nowhere to be found. I ______ when I was on the bus.
选项 A、must have dropped it
B、must drop it
C、should have dropped it
D、ought to have dropped it
答案A
解析 情态动词。“must+have+过去分词”表示对过去发生的事情的推测。
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