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        1. 【題目】As we all know, using public chopsticks ________ necessary when we eat with others.

          A.isB.areC.was

          【答案】A

          【解析】

          句意:眾所周知,當(dāng)我們和別人一起吃飯時(shí),使用公筷是有必要的。

          考查be動(dòng)詞。A. is用于第三人稱單數(shù)或單數(shù)名詞后;B. are用于第二人稱或復(fù)數(shù)名詞后;C. was過(guò)去式,用于第一、三人稱單數(shù)后。根據(jù)句意可知,對(duì)事實(shí)進(jìn)行陳述應(yīng)用一般現(xiàn)在時(shí),故C選項(xiàng)可排除。句中主語(yǔ)using public chopsticks為動(dòng)名詞短語(yǔ),動(dòng)名詞短語(yǔ)作主語(yǔ)時(shí),謂語(yǔ)動(dòng)詞用單數(shù)。故選A。

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