Question

They had kept working for several weeks      everything was in order.

A．before

B．after

C．since

D．unless

Answer 1

A

试题分析：句意：他们持续不断工作了几个星斯后，一切才恢复正常。before “在……之前，过了多久后才……”；after “在……后”； since “自从”； unless “除非”。根据句意故选A
点评：连词主要考查它的意义及用法，需要考生平时注意它们的区别及用法。还要会分析语言环境的影响。
即学即练：It won't be long     the he comes back.
A. before        B. after          C. since          D. unless
解析：A 句意：不久之后他就将回来。