I don' t think Xiao Li is ____ the other students ____ mathematics.
A. after, on
B. after, with
C. behind, in
D. behind, at
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Nobody knows it ____ me.
A. except for
B. except that
C. besides
D. but
The window is never opened ____ in summer.
A. but
B. except
C. except for
D. but for
It happened ____ the Long March.
A. during
B. in
C. at
D. for
We go to school ____ a bike.
A. in
B. on
C. by
D. ove