This monument was built in honor of the scientist who was believed the first telephone. A

问题补充：

This monument was built in honor of the scientist who was believed the first telephone.

A. to invent

B. to have been invented

C. to have invented

D. having been invented

答案：

A. to invent

B. to have been invented

(答案→)C. to have invented

D. having been invented

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