She knows a lot about China as she has been to China .A. for the forth timeB. four timesC.

问题补充：

She knows a lot about China as she has been to China .

A. for the forth time

B. four times

C. a fourth time

D. for four times

答案：

A. for the forth time

(答案→)B. four times

C. a fourth time

D. for four times

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