20.There useda post office at the corner of the street.A. to beB. to beingC. to haveD. to

问题补充：

20.There useda post office at the corner of the street.

A. to be

B. to being

C. to have

D. to having

答案：

(答案→)A. to be

B. to being

C. to have

D. to having

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