My father will be back ______ the morning of May 15. 
#49010
A
in
B
at
C
on
D
since
推荐题目
The police found the lost car _____.  
#48414
A
by mistake
B
by accident
C
with mistake
D
in accident
Please open a window _________ turning on air conditioning.
#47107
A
instead of
B
instead
C
not
D
rather