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.