( )in the sports bag? Two tennis balls A：What are B:What does C:W_英语解答

( )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

人气：430 ℃　时间：2019-10-19 13:43:30

解答

c
不明情况,用单数be动词.恩恩！谢谢！