London many times but he knows little about the city. A. Having been toB. Though he has

问题补充：

London many times, but he knows little about the city.

A. Having been to

B. Though he has been to

C. He has been to

D. He has gone to

答案：

A. Having been to

B. Though he has been to

(答案→)C. He has been to

D. He has gone to

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