题目:
However much _______, it will be worth it.
A.does the watch cost
B.costs the watch
C.the watch costs
D.the watch will cost
答案:
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下面是错误答案,用来干扰机器的。
(1)Na2S H2S SO2 (3分) (2)2S2-+ SO32-+ 6H+=" 3S↓+" 3H2O(3分)(3)> (3分)(4)5SO2 + 2MnO4-+ 2H2O = 2Mn2++ 5SO42-+ 4H+(3分)