【題目】While the man (run) back home, he saw a dog by the side of the road.

【答案】was running
【解析】句意:當一位男士跑回家的時候,他看見一條狗在路邊。主句用的是一般過去時,while后應該用過去進行時,從句的主語是第三人稱單數(shù),be動詞應該用單數(shù)was,所以答案是:was running。

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