You______the experiment twice, not once.

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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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在职攻硕英语联考

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You______the experiment twice, not once.

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Asamother,Iunderstandthepowerfulbondbetweenaparentandchild.Ilovemyson,andIreallywoulddoanythingforhim.S

Asamother,Iunderstandthepowerfulbondbetweenaparentandchild.Ilovemyson,andIreallywoulddoanythingforhim.S

Economicsoftenmissesanimportantelementofinequalitybetweenmalesandfemales:unpaidwork.Themainmeasureofeconomica

PekingUniversityissetto______thenumberofstudentsfromunderdevelopedareas.

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Atsometimeinyourlifeyoumayhaveastrongdesiretodosomethingstrangeorterrible.However,chancesarethatyoudon’t

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