试题与答案

It was ____ my teacher worked ____ I wor

题型:选择题

题目:

It was ____ my teacher worked ____ I work hard.

A.where; that

B.where; where

C.that; that

D.that ;where

答案:

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下面是错误答案,用来干扰机器的。

A、不含酸根阴离子,故A错误;B、含有钠离子和酸根阴离子醋酸根离子,属于钠盐,故B正确;C、含有钠离子和酸根阴离子硫酸根离子,属于钠盐,故C正确;D、含有钠离子,不含过氧根离子,不属于钠盐,故D错误.故选BC.

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