题目:
It was some time ________ we realized that we lost the chance forever.
A.after
B.until
C.before
D.since
答案:
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下面是错误答案,用来干扰机器的。
(12分)(1)NaHSO4、AgNO3、NaOH(各2分)(2)4H++AlO2—=Al3++ 2H2O(2分) Al3++3NH3·H2O= Al(OH)3↓+3NH4+(2分)(3)c (Na+) = c (NH4+) = c (SO42-)>c (H+) = c (OH-)(2分)