Salts can be prepared by______an acid with a base or a metal.A、mixB、mixingC、mi

游客2024-01-02 49

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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[audioFiles]audio_etoefz_013(20051)[/audioFiles]A、Shehasn’tpreparedthecours