2. 外语
  3. Li Lei didn’t meet the famous American professor ______ he was on holiday last year.

Li Lei didn’t meet the famous American professor ______ he was on holiday last year.

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问题 Li Lei didn’t meet the famous American professor ______ he was on holiday last year.
选项 A、unless
B、until
C、if
D、whether
答案B
解析
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