【題目】—Who (mop) the floor at this time yesterday?
—My mother.

【答案】was mopping
【解析】句意:昨天的這個時候誰在拖地板?—我媽媽。本句描述的是過去正在發(fā)生的事情,使用過去進行時態(tài):was/were+動詞現(xiàn)在分詞。故填: was mopping。

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