Some volunteers(志愿者) from Beijing arrived in ShanghaiApril 29 to work for the World Expo.A

问题补充：

Some volunteers(志愿者) from Beijing arrived in ShanghaiApril 29 to work for the World Expo.

A. on

B. at

C. of

D. to

答案：

(答案→)A. on

B. at

C. of

D. to

解析：考查：在几月几日，应用介词on，题中在四月二十九号应表达为on April 29，所以选A。

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