It will be only thirty minutes the boss back. [ ] A．afterB．before C．untilD．as 题目和参考答案——青夏教育精英家教网—

题目内容

It will be only thirty minutes ________ the boss back.

[　　]

A．after

B．before

C．until

D．as

答案：B
解析：

导解：“在老板回来之前”有30分钟．

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