2. 外语
  3. Salts can be prepared by______an acid with a base or a metal.

Salts can be prepared by______an acid with a base or a metal.

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问题 Salts can be prepared by______an acid with a base or a metal.
选项 A、mix
B、mixing
C、mixed
D、to mix
答案B
解析 The preposition by needs a gerund as its object: mixing.
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