When was it ________ you met him in the library?
When was it ________ you met him in the library?
A.where
B.that
C.in which
D.which
答案及解析： B
解析：
【巧解导析】可以看出，这是强调句型的特殊疑问式．
When was it ________ you met him in the library?
A.where
B.that
C.in which
D.which
答案及解析： B
解析：
【巧解导析】可以看出，这是强调句型的特殊疑问式．