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

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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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