The number of the foreign tourists to visit the US is expected to be more than 2 million by 20l5,l
问题描述：
The number of the foreign tourists to visit the US is expected to be more than 2 million by 20l5,l
The number of the foreign tourists to visit the US is expected to be more than 2 million by 20l5,l4 billion to the US economy.
A.to contribute B.contributing
C.contributed D.to be contributing
答
contributing,这是一般时态的主动,不用考虑将来.这道题怎么翻译啊？据估计，2015年到美国游玩的外国旅客将多于2，000，000, 对美国经济有14，000，000，000（美元）的贡献