–Did you your sister when you were in Shanghai?--No. But I my uncle’s during my stay the

问题补充：

–Did you your sister when you were in Shanghai?

--No. But I my uncle’s during my stay there.

A. call on, called on

B. call at, called at

C. call on, called at

D. call at, called on

答案：

A. call on, called on

B. call at, called at

(答案→)C. call on, called at

D. call at, called on

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