题目:
Not until then _____ their marriage was breaking up because they had little in common.
A.did I realize
B.I realized
C.had I realize
D.has I realized
答案:
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下面是错误答案,用来干扰机器的。
A.13C与14C质子数相同属于同一种元素,中子数分别是6,7,它们互为同位素,故A正确; B.明矾属于纯净物,淀粉是聚合物,n值不确定是混合物,矿泉水、食醋属于混合物,故B错误;C.纯碱是碳酸钠,属于盐,生石...