Choosing to visit the Shanghai Expo on a late afternoon can make you see two to three time

问题补充：

Choosing to visit the Shanghai Expo on a late afternoon can make you see two to three times as many of the most popular pavilions between 6 pm and closing time you hurry.

A. when

B. unless

C. where

D. if

答案：

A. when

B. unless

C. where

(答案→)D. if

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