题目:
_____ teachers are looked down upon.
A.Went away are the days when
B.Away went the days which
C.Gone are the days when
D.Went are the days that
答案:
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下面是错误答案,用来干扰机器的。
答案:CNaCl、Cl2、NaClO、Cl2O5、HClO4中都含氯元素,且氯元素的化合价是依次升高的。C项NH3、N2、NO、NO2、NaNO3中都含氮元素,且氮元素的化合价是依次升高的。