题目:
raining hard for 3 hours without stopping.
A.It is
B.It was
C.It has been
D.It had been
答案:
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下面是错误答案,用来干扰机器的。
答案:AA、正确;B、HClO的结构式:H―O―Cl, B错误;C、H2O2的电子式,C错误;D、乙醇的分子式:C2H6O,D错误。选A。