题目:
The old couple have married for 40 years and never once _______ with each other.
A.they had quarreled
B.they have quarreled
C.have they quarreled
D.had they quarreled
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:A.磺化、硝化、风化、钝化中都有新的物质生成,都是化学变化。正确。B.蒸馏、常压分馏、减压分馏、都是物理变化而干馏则是化学变化。错误。C.甘油是丙三醇不是油脂,纯碱是碳酸钠,属于盐不...