. People couldn't help the foolish emperor in the procession.A. laugh atB. to laugh atC.

问题补充：

. People couldn help the foolish emperor in the procession.

A. laugh at

B. to laugh at

C. laughing at

D. laughing on

答案：

A. laugh at

B. to laugh at

(答案→)C. laughing at

D. laughing on

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