—Winter swimming is exciting, but one can't do it ________ he or she has got some training.—Exactly! It can be dangerou

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1. (2018·扬州模拟) —Winter swimming is exciting, but one can't do it ________ he or she has got some training.
—Exactly! It can be dangerous.

A . after B . unless C . if D . while

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江苏省扬州市2018届九年级英语第一次模拟考试试卷