Sorry to have kept you waiting so long, but it’ll still be some time () Mr. Smith is available. ( 章节：4 难度：1)
- A、when
- B、before
- C、after
- D、since
正确答案:B
答案解析:有
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Sorry to have kept you waiting so long, but it’ll still be some time () Mr. Smith is available. ( 章节：4 难度：1)
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