The boss thinks ________ you are not good at English, you should change ajob．A.thatB.whyC.sinceD.whether
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C解析think是及物动词，后面应跟一个宾语从句．这个宾语从句又是个复合句，所以应先弄清是个什么从句．根据意思和所给的几个连词可知该复合句的意思是：既然你不擅长英语，你应该换个工作．所以空上应填since“既然”．think后连接的复合句的连词应是that，被省略．请看该句型：The boss thinks+［(that省)+(since you are not good at English,)you should change a job］．