问题
选择题
But for the sudden rainstorm, our trip to Hong Kong _____ a very pleasant one.
A．was
B．would have been
C．would be
D．had been
答案
答案：B
if 虚拟的一种，对过去虚拟， if 后用had done , 主句用would/ could /might have done.如果句子内没有if, 可用but for, without .
例如： But for your help, I wouldn’t have finished the job.
Without your help, I wouldn’t have finished the job.