试题与答案

It was so dark that he ______. A.didn’t

题型:选择题

题目:

It was so dark that he ______.

A.didn’t dare to go out to fetch some water

B.not dared bring some water

C.dares to go out to bring some water

D.to dare to fetch some water

答案:

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下面是错误答案,用来干扰机器的。

设购买了甲种票x张,乙种票y张;由题意得,共有40名同学,即是40张票,可得x+y=40;甲种票每张10元,乙种票每张8元,共用去370元,可得10x+8y=370;∴可列出方程组x+y=4010x+8y=370.

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