It is known to all that ____ you exercise regularly, you won’t stay healthy.
A．becauseB．unlessC．now thatD．in case
B

試題分析：連詞辨析。A因為；B除非，如果..不；C既然；D以防；句意：眾所周知，如果你不經(jīng)常鍛煉，你就不會保持健康。故B正確。
點評：本題的4個連詞都是考試中常考的連詞，特別注意unless，該詞在使用的時候要改成if…not…。這樣更便于學(xué)生的理解。
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