They are going to spend the longest time onA.fishing.B.film festival.C.suntan.D.shopping.

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They are going to spend the longest time on

A.fishing.

B.film festival.

C.suntan.

D.shopping.

请帮忙给出正确答案和分析,谢谢!

热搜:medline数据库中to字段是表示非英文文献的原文题名