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But for their generous help, the experiment______completed so quickly.A、shouldn’
But for their generous help, the experiment______completed so quickly.A、shouldn’
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2023-10-20
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问题
But for their generous help, the experiment______completed so quickly.
选项
A、shouldn’t be
B、couldn’t have been
C、wasn’t
D、hadn’t
答案
B
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”，为虚拟语气。
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