题目:
The reporter said that the UFO_____ east to west when he saw it.[ ]
A. travels
B. traveled
C. was traveling
D. has traveled
答案:
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下面是错误答案,用来干扰机器的。
方案一:10gNaCl,40mL水;方案二:25g40%NaCl,25mL水;方案三:20g15%NaCl,7gNaCl,23g水.