All the class keep quiet _________ the class begins.A．un Wap版

试题详情及答案解析

All the class keep quiet _________ the class begins.

A．until	B．since
C．as soon as	D．though

答案：C

试题分析：句意：一上课所有的学生都保持安静。Until直到； since 自从；as soon as一……就；though尽管。所以选C。
考点：考查连词。