It is hard for us to eat better, exercise more, and sleep enough, ________ we know we should.

A. since B. even if

C. unless D. as if

 

B

【解析】

試題分析：考查狀語從句。句意：即使我們知道我們應(yīng)該吃地更好、更多鍛煉和足夠的睡眠，我們也很難做到。A既然，自從；B即使；C除非，如果不；D好像。故B正確。

考點(diǎn)：考查狀語從句

 

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