题目内容
---I haven't heard from my sister since last month .
---Don't worry, Charlie. Letters from the United States ________be slow sometimes.
- A.need to
- B.should
- C.can
- D.ought to
C
导解:can表示理论上、习惯上的“可能会,有时会”.
导解:can表示理论上、习惯上的“可能会,有时会”.
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