问题补充:
The man will have to wait all day the doctor works faster.
A. if
B. unless
C. whether
D. that
答案:
A. if
(答案→)B. unless
C. whether
D. that
解析:此题是unless引导一个条件状语从句的用法。根据题意:如果医生不快点工作的话,我们就会等上一整天,只有B合意。
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