问题

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

正确答案是：

同类题型

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Haveyou got any job offers 一No．II’ll not give up，whatever the result is

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He always eats ______ . He is ______ fat.

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