It often takes __________ hour to cook.[_爱下问搜题

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问题选择题

It often takes __________ hour to cook.[ ]

A. an

B. the

C. a

D. /

答案

答案：A

选择题

My sister ______ go to bed _______ my mother came back last night.

A．not until

B．doesn't; until

C．didn't; until

D．aren't; until

填空题

石墨炉法的检测下限（）火焰法。