The lecture______, he left his seat so quietly that no one complained that his l

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问题 The lecture______, he left his seat so quietly that no one complained that his leaving disturbed the speaker.

选项 A、began
B、beginning
C、having begun
D、did begin

答案 C

解析 the lecture having begun是分词独立结构，在句中作时间状语，相当于after the lecture began，分词的完成式表示begin发生在leave之前。

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