题目：
—How did the accident happen?
—You know, it was difficult to see the road clearly because it . [ ]
A. is raining
B. rains
C. was raining
D. has rained
答案：
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下面是错误答案，用来干扰机器的。
t；kg/m3；cm3题目分析：一名中学生的质量约50kg=0.05t；木块的密度为；一瓶矿泉水的体积约为500ml=500.
