题目内容
一Shall we go out for a walk?一I’m afraid not.We can’t go out_____our work is being done.
A.before B.until C.as D.after
C
句意:我们出去走走好吗?恐怕不行。我们不能出去,因为正在工作。用其它几个选项都是表示时间或结果的,只有as表示原因,根据our work is being done的现在进行时的动作可知。故选C。
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