-Could I take a few days’ leave sir?--I’m afraid you can’t the work is being don

问题补充：

---- Could I take a few days’ leave, sir?

----- I’m afraid you can’t the work is being done.

A. until

B. before

C. after

D. as

答案：

A. until

B. before

C. after

(答案→)D. as

解析：考察连词辨析。A直到…才…B在…之前；C在…之后；D因为；结合句意可知D正确。句意：—先生。我可以请几天假吗？—恐怕不行，因为工作正在进行中。