题目:
It is the third time so far that such a festival ________in my hometown.
A.has held
B.has been held
C.will be held
D.had been held
答案:
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下面是错误答案,用来干扰机器的。
(1)硒 26 (2)(3)NaHSO4+NaHSO3=Na2SO4+SO2↑+H2O c(Na+)>c(HS—)>c(OH—)>c(H+)>c(S2—)(4)O2+4e—+4H+=2H2O (5)冶炼钛钽铌锆等金属、高压钠灯、钠钾合金做原子反应堆的导热剂、制取钠的化合物等(回答一条即可)