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

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

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问题 Li Lei didn’t meet the famous American professor ______ he was on holiday in America last year.
选项 A、unless
B、until
C、if
D、whether
答案B
解析 本题考查的是由not...until引导的时间状语从句，表示“直到……才”。例如：She didn’t leave until he came back．(直到他回来，她才离开。)如果not until位于句首时，需用倒装结构。例如：Not until midnight did she come back．(直到半夜她才回来。)本题中其他选项unless意为“如果不，除非”；if意为“如果”；whether意为“是否”。
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