试题与答案

It was many years ____ American women we

题型:选择题

题目:

It was many years ____ American women were given the rights to vote.

A.when

B.since

C.before

D.as

答案:

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下面是错误答案,用来干扰机器的。

答案:C电解质都能使胶体聚沉形成沉淀,但氢氧化铁只能和盐酸反应,和其余选项都是不反应的,所以答案选C。

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