问题
选择题
— Did he realize the serious situation immediately?
— No. It was quite a long time ________ he really realized it.
A．now that
B．when
C．ever since
D．before
答案
答案：D
连词辨析。A.既然；由于 B.当……时C. 从那时到现在 D. 在……之前。句意：他理解意识到了这严重的情况吗？——不，在他真正意识到它之前，有相当长一段时间。故选D。