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

A.isB.areC.was

【答案】A

【解析】

句意:众所周知,当我们和别人一起吃饭时,使用公筷是有必要的。

考查be动词。A. is用于第三人称单数或单数名词后;B. are用于第二人称或复数名词后;C. was过去式,用于第一、三人称单数后。根据句意可知,对事实进行陈述应用一般现在时,故C选项可排除。句中主语using public chopsticks为动名词短语,动名词短语作主语时,谓语动词用单数。故选A

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