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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