2. 专升本
  3. Sorry, I didn’t know______ Dr. Smith has already returned from his holiday. I’ 11 go and see him in a minute.

Sorry, I didn’t know______ Dr. Smith has already returned from his holiday. I’ 11 go and see him in a minute.

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问题 Sorry, I didn’t know______ Dr. Smith has already returned from his holiday. I’ 11 go and see him in a minute.
选项 A、that
B、when
C、whether
D、if
答案A
解析
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