Was it in the school reading room you found the missing book?A. whoB. thatC. whichD. when

问题补充：

Was it in the school reading room you found the missing book?

A. who

B. that

C. which

D. when

答案：

A. who

(答案→)B. that

C. which

D. when

解析：考查强调句型。It is/was 被强调成分that/who 其他成分 构成强调句型。句意：你是在学校阅览室里发现那本丢失了的书吗？