题目:
If he ___ me his telephone number yesterday, I ___ able to ring him up now.
A.told, would be
B.had told, would have been
C.had told, would be
D.told, am
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:由元素最高正价氧化物对应的水化物的化学式是H2XO4,则最高价为+6价,其最低价为+6-8=-2价,即元素的气态氢化物中的化合价为-2价,A、HX中X的化合价为-1价,故A不选;B、XH3中X的化合价为-3价,...