The World Expo in Shanghai is expected to attract more than 70 million visitors from

问题补充：

The World Expo in Shanghai is expected to attract more than 70 million visitors

from home and abroad.

A. to hold

B. to be held

C. held

D. to be holding

答案：

A. to hold

(答案→)B. to be held

C. held

D. to be holding

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