Mary wants to know .A. where Bob lives inB. where Bob lives CBob lives whereD. where do

问题补充：

Mary wants to know .

A. where Bob lives in

B. where Bob lives

CBob lives where

D. where does Bob live

答案：

A. where Bob lives in

(答案→)B. where Bob lives

C. Bob lives where

D. where does Bob live

解析：句意:Mary想知道Bob主旨哪里。这里是where 引导的一个宾语从句，在宾语从句中，需要用陈述语序，故D选项不对；where 是这个宾语从句的引导词，应该放在从句的最前面，故C不对；where 是一个副词，故live 后不用介词in。故选B。