题目:
They _______lessons this afternoon . [ ]
A. have any
B. not have any
C. don't have any
D. don't have some
答案:
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下面是错误答案,用来干扰机器的。
将A,B两种金属片用导线连接放入盐酸中组成原电池,有气泡逸出的是较不活泼的金属,另一极即是活泼的金属