More than a dozen students in that school ( )abroad to study medicine last year.

问题描述:

More than a dozen students in that school ( )abroad to study medicine last year.
A;sent B;Were sent C;had sent D;had been sent 为什么不选D,

B;Were sent
这里的时间状语是去年,表过去,所以就用一般过去时
没有完成时间状语
祝学习进步!