. ---Professor Wang is said in New York. ---No wonder he knows a lot about America.A. to

问题补充：

. ---Professor Wang is said in New York.

---No wonder he knows a lot about America.

A. to study

B. to have studied

C. to be studying

D. that he is studying

答案：

A. to study

(答案→)B. to have studied

C. to be studying

D. that he is studying

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