问题补充:
If It had been possible, I would have helped him, but I too busy the.
A. had been
B. would be
C. were
D. was
答案:
A. had been
B. would be
C. were
(答案→)D. was
解析:前面是一个与过去事实相反的虚拟语气,but引导的真实情况。
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