It’s not bad manners to play a trick your friend on April Fool’s Day.A. inB. onC. toD. ab

问题补充：

It’s not bad manners to play a trick your friend on April Fool’s Day.

A. in

B. on

C. to

D. about

答案：

A. in

(答案→)B. on

C. to

D. about

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