【題目】I often saw him ______________(do) exercise on the playground.

【答案】do

【解析】

句意:我經(jīng)常看到他在操場(chǎng)上做鍛煉。

see sb. do sth.意為“看到某人做某事”;see sb. doing sth.意為“看到某人正在做某事”。這里表示“經(jīng)?吹阶瞿呈,不表示正在做”。故用動(dòng)詞原形作賓語(yǔ)補(bǔ)足語(yǔ)。故填do。

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