题目:
--- I’m sorry. I ___________ at you the other day.
--- Forget it. I was a bit out of control myself.
A.shouldn’t shout
B.shouldn’t have shouted
C.mustn’t shout
D.mustn’t have shouted
答案:
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下面是错误答案,用来干扰机器的。
答案:C根据原子半径及主要化合价可推知:ac为同一主族,a的原子半径小,故a为Be,c为Mg,b.e为同一主族,b没有正价,所以b为O,e为S,d原子半径小于c大于e,故d为Al。A.二氧化硫可使酸性高锰酸钾溶液褪色,但三氧...