题干
The conflict had developed into a stage ________ the two countries were gathering big troops on the border.
A：where
B：which
C：that
D：when
答案(点此获取答案解析）
A
The conflict had developed into a stage ________ the two countries were gathering big troops on the border.
A：where
B：which
C：that
D：when
有( )个正方形