where is sam?Do you know?Look!He is _____on the beach.A.swimming B.lying C.looking D.having 选啥

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where is sam?Do you know?Look!He is _____on the beach.A.swimming B.lying C.looking D.having 选啥

选b呀,look是现在进行时的标志,且lying on the beach是一般的搭配