【題目】Forty percent of students usually(exercise ) on the playground.

【答案】exercise
【解析】句意:有40%的學(xué)生經(jīng)常在操場(chǎng)鍛煉。exercise鍛煉, 是一個(gè)動(dòng)詞。根據(jù)句意和句中的usually可知,這句話表示經(jīng)常性的動(dòng)作,應(yīng)使用一般現(xiàn)在時(shí)態(tài),主語(yǔ)是Forty percent of students,百分?jǐn)?shù)修飾名詞作主語(yǔ)的時(shí)候,謂語(yǔ)動(dòng)詞應(yīng)跟名詞一致,所以這里用復(fù)數(shù),填動(dòng)詞的原形。

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