They are having a great time __ inThey are having a great time __ in the pool A to swimming B swim C to swim D swimming

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They are having a great time __ inThey are having a great time __ in the pool A to swimming B swim C to swim D swimming

They are having a great time __ inThey are having a great time __ in the pool A to swimming B swim C to swim D swimming
They are having a great time __ in
They are having a great time __ in the pool A to swimming B swim C to swim D swimming

They are having a great time __ inThey are having a great time __ in the pool A to swimming B swim C to swim D swimming
选D,have a great time doing sth.

great time 下面借to doing sth. 故选A