.The other day I was showing the boys the weekly chemistry experiment when, ________ I knew it, the mixture was bubbling over everywhere.A．ifB．beforeC．thoughD．-高中英语-n多题

◎ 题干

.The other day I was showing the boys the weekly chemistry experiment when, ________ I knew it, the mixture was bubbling over everywhere.

A．if

B．before

C．though

D．unless

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“.The other day I was showing the boys the weekly chemistry experiment when, ________ I knew it, the mixture was bubbling over everywhere.A．ifB．beforeC．thoughD．…”主要考查了你对【可数名词及其单复数】，【动名词】，【表语从句】，【缩写与简写】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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