28. (单选题) _____ I was studying there, I began to learn skiing.( )(本题3.0分) A、 whenever B、 while C、 what D、 how

28. (单选题) _____ I was studying there, I began to learn skiing.( )(本题3.0分)
A、 whenever
B、 while
C、 what
D、 how

出自：赤峰学院-英语

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