You______the experiment twice, not once.A、should have carried outB、shouldn’t ha

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问题 You______the experiment twice, not once.

选项 A、should have carried out
B、shouldn’t have carried out
C、haven’t carried out
D、couldn’t have carried out

答案 A

解析 “should+不定式完成式”表示“本应该做而实际没有做”的虚拟语气含义。

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