【C5】A．workingB．teachingC．playingD．learning

The missing boys were last seen （) near the river.A、to playB、playC、to be playingD、playi

How long have you been _（) on board？A.workingB.makingC.acting

__________ 查看材料A.workingB.dyingC.talkingD.dreaming

We often ______ in the yard.A、playsB、playC、playingD、played

Mark and Paul can ______ basketball.A、playB、playsC、playingD、played

【C15】A．workingB．stayingC．movingD．shopping