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”,故B项为正确答案。又如:Ididn’t sleep until my mother got home.(直到妈妈回到家,我才入睡。)如果放于句首,句子要倒装,如:Not until mid-night did his father stop working.(直到午夜他父亲才停止工作。)
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