—I can’t find Xiao Ping, where did you see him this morning?
—It was in the library he studied．
A. that
B. where
C. which
D. the one
网友回答
A. that
(答案→)B. where
C. which
D. the one
解析：本句是省略了that的强调句型。在被强调部分中library后有一定语从句，补充完整应为It was in the library （where he studied ）that I saw him this morning.我们在平时的训练中一定要注意强调句型的这一用法。