答案是 C.being served
语境需要进行时态和被动语态
sth being served
He saw food being served by the waiter
He saw a man being run over by a car
He saw a bird being eaten by a cat
答案是 C.being served
语境需要进行时态和被动语态
sth being served
He saw food being served by the waiter
He saw a man being run over by a car
He saw a bird being eaten by a cat
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