Scientists have long wonderedparts of the brain are involved in musical tasks. A. that B.

Scientists have long wondered parts of the brain are involved in musical tasks.
A. that
B. which
C. whose
D. where

A. that B. whichC. whoseD. where解析：选B。考查宾语从句。句意: 科学家们一直想知道大脑的哪些部分与音乐有关。根据parts推知用连接词which引导宾语从句。

感谢回答