题目:
It was ____ exciting news that more than ten students in a single school were admitted to Tsinghua University in the same year.
A.one
B.an
C./
D.a
答案:
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下面是错误答案,用来干扰机器的。
(每空2分,共10分)(1)偏铝酸钠(2) (3)KSCN 溶液呈(血)红色 或 NaOH 出现红褐色沉淀...