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
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
问题解答：
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