( )in the sports bag? Two tennis balls A:What are B:What does C:What's D:What do顺便问一下:在不知道答案是单复数的情况下;提问时BE动词用单数还是复数

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( )in the sports bag? Two tennis balls A:What are B:What does C:What's D:What do
顺便问一下:在不知道答案是单复数的情况下;提问时BE动词用单数还是复数

c
不明情况,用单数be动词.