when____why,he kept silent a.asking b.ask c.asked d.being asked

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when____why,hekeptsilenta.askingb.askc.askedd.beingaskedwhen____why,hekeptsilenta.askingb.askc.asked

when____why,he kept silent a.asking b.ask c.asked d.being asked
when____why,he kept silent a.asking b.ask c.asked d.being asked

when____why,he kept silent a.asking b.ask c.asked d.being asked
c 这是一个省略句,asked前面省略了 he was 英语中的省略句只能是主语和系动词一起省略