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The old man down by a truck is being saved now. A. knocking B. to knock C. knock

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The old man down by a truck is being saved now. A. knocking B. to knock C. knock

The old man ____ down by a truck is being saved now.

A. knocking   B. to knock   C. knocked   D. being knocked

 

试题答案

【答案】

C

【解析】

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