I remember early spring mornings in the countryside my grandmother would tell me to sit quietly and then read me books.
A. which
B. why
C. where
D. when
网友回答
A. which
B. why
C. where
(答案→)D. when
解析： 考查定语从句，先行词为early spring mornings，后面的从句不缺少主语或宾语，缺少时间状语，所以用when，句意：我记得在乡下春天的早晨，我的奶奶经常告诉我静静的坐下来给我读书。故选D。