2. 外语
  3. I( )my wallet when I was shopping in the store.

I( )my wallet when I was shopping in the store.

admin2016-04-30  32
问题 I( )my wallet when I was shopping in the store.
选项 A、must have dropped
B、should have dropped
C、could drop
D、ought to have dropped
答案A
解析 本题考查情态动词表示推测的用法。must have done sth．表示对已经发生的事情的肯定猜测。这道题是对过去所发生的事情的推测，因此应选择A。
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