It is difficult for any of us to eat bet...

It is difficult for any of us to eat better, exercise more, and sleep enough, ________we know

we should.

A. because B. even if

C. unless D. before

B 【解析】试题分析：考查状语从句。句意：即使我们知道应该注意饮食，保证充足睡眠和多锻炼身体，但很少有人能做到。A因为；B即使；C除非；D在......之前。根据句意可知，前后分句表示的是转折关系，故选B。考点：考查状语从句

考点分析：

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