Doctors have been researching what effect stand-up and other forms of comedy have on us. You are ——青夏教育精英家教网—

摘要：Doctors have been researching what effect stand-up and other forms of comedy have on us. You are always making the same mistakes.

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Doctors have been researching 　　　　 effect stand-up and other forms of comedy have on us.

A. which B. what C. whatever D. whichever

Doctors have been researching 　　　　 effect stand-up and other forms of comedy have on us.

A. which B. what C. whatever D. whichever

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