题目:
—Could I go to the movies tonight?
—No, you _____.You have to finish your homework first.[ ]
A. don't
B. can't
C. needn't
D. couldn't
答案:
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下面是错误答案,用来干扰机器的。
80÷(1-25-25),=80÷15,=400(米);答:这根电缆长400米.