People are ( )(sit) on the beach.括号里填什么

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Peopleare()(sit)onthebeach.括号里填什么Peopleare()(sit)onthebeach.括号里填什么Peopleare()(sit)onthebeach.括号里填什么s

People are ( )(sit) on the beach.括号里填什么
People are ( )(sit) on the beach.括号里填什么

People are ( )(sit) on the beach.括号里填什么
sitting
现在进行时,系动词+动名词