Doctors have been researching 　　　　 effect stand-up and other forms of comedy have on us.
A．which B．whatC．whatever D．whichever
B

試題分析：句意：醫(yī)生一直在研究單口喜劇和其他的喜劇形式對(duì)我們有什么影響。這里research后面接的是賓語從句，因?yàn)閑ffects前面缺少定語，用what連接賓語從句，which哪個(gè)，whatever“凡是…的東西”，whichever“凡是哪個(gè)”，都不符合句意，選B。
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