题目内容
—How long will it be ________ the professor makes another visit to China?
—It all depends.
A.until
B.before
C.since
D.when
B解析:此题考查时间状语从句。句意是:“要过多长时间,教授才再次访问中国?”“看情况而定吧。”主语部分是It will be+时间段 how long,后面常跟before,表示“离……还有多长时间”。
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