In the survey they listed twelve kinds of food would affect the work of the brain．
A. which the experts believed
B. that were believed
C. the experts believed that
D. the experts believed
网友回答
(答案→)A. which the experts believed
B. that were believed
C. the experts believed that
D. the experts believed
解析：考查定语从句。the expert believed 是插入中间修饰的。句中主干是In the survey they listed twelve kinds of food which (the expert believed) would affect the work of the brain句意：在调查中，他们罗列的12种（专家相信的）会影响脑部运作的食物。。