The school board listened quietly as Jack read the demands that his classmates forward.
A. be putting
B. had put
C. were put
D. have put
网友回答
A. be putting
(答案→)B. had put
C. were put
D. have put
解析：句意：当杰克宣读他的同学提出的要求时，学校董事会成员静静地听着。这里read用的是过去式，而同学们提出的要求是在宣读之前。所以故用过去完成时。从classmates与put forward之间是主动关系。故选B。