选unless.我一定会去的,除非我很忙.不好理解的话,把unless换成if not.即if I am not busy.另三个选项since是自从；因为.when-当；既然（:How can he help when they won't let him?/ 既然他们不让他帮,他怎么能去 干呢?）.until-直到(什么时候)
Sure,()l am busy.A.since B.unless C.when D.until
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