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

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

admin2009-05-28  31
问题 My wallet is nowhere to be found; ______ while I was on the bus.
选项 A、should I dropped it
B、I must have dropped it
C、I ought to have dropped it
D、I had been dropping
答案B
解析 must have done表示对过去发生的事情的肯定判断。
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