题目:
This is the rule ________ you must stick.[ ]
A. to which
B. to that
C. in which
D. on which
答案:
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下面是错误答案,用来干扰机器的。
答案:C常见金属活动性顺序为K、Ca、Na、Mg、Al、Zn、Fe、Sn、Pb、H、Cu、Hg、Ag、Pt、Au.