单选题But for their generous help, the experiment ______ completed so quickly.Ashouldn’t beBcouldn’t have beenCwasn’tDhadn’t
单选题
But for their generous help, the experiment ______ completed so quickly.
A
shouldn’t be
B
couldn’t have been
C
wasn’t
D
hadn’t
参考解析
解析：
句意：要不是他们慷慨相助，试验不可能这么快完成。but for要不是…，位于句首句子用虚拟语气。couldn’t have been本不可能实现但却实现了，虚拟语气。
句意：要不是他们慷慨相助，试验不可能这么快完成。but for要不是…，位于句首句子用虚拟语气。couldn’t have been本不可能实现但却实现了，虚拟语气。
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