Question

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

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

Answer 1

B

试题分析：句意：医生一直在研究单口喜剧和其他的喜剧形式对我们有什么影响。这里research后面接的是宾语从句，因为effects前面缺少定语，用what连接宾语从句，which哪个，whatever“凡是…的东西”，whichever“凡是哪个”，都不符合句意，选B。