公共英语一级

单选题I’m busy now，so it will be some time __________I can leave．

A．before
B．after
C．when

参考答案：A进入在线模考
句意：我现在很忙，所以过一段时间才能离开。本题考查连词的用法。这三个连词都可以引起时间状语从句，但意思不同，before在…之前；after在…之后；when当…时候。结合句意“过一段时间才能离开”，即在离开之前有一段时间。故A项正确。

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