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  3. It is known to all that______you exercise regularly, you won’t keep good health.

It is known to all that______you exercise regularly, you won’t keep good health.

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问题 It is known to all that______you exercise regularly, you won’t keep good health.
选项 A、if
B、unless
C、although
D、whenever
答案B
解析 if：如果；unless：如果不，除非；although：尽管；whenever：不论何时。根据句意可知，应用unless来引导从句，相当于if…not.故选B。
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