Not until I began to work ______ how mu...

Not until I began to work ______ how much time I had wasted.　

A．didn't I realize	B．did I realize
C．I didn't realize	D．I realize

B 【解析】试题分析：句意，直到我开始工作，我才意识到自己已经浪费了很多时间。not until，引导的时间状语从句置于句首，从句要用陈述语序，主句要用倒装语序，故选B。考点：not until，引导的时间状语从句的考查。

考点分析：

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