– I’m sorry I stepped on your toe; it was an accident. – It wasn’t! You did it ______.
#13584
A
by accident
B
at present
C
on purpose
D
at dusk
推荐题目
This book ____ 12 units, _____ the unit of Music. 
#12997
A
contains. Including
B
includes; containing
C
contains, includes
D
including; contains
His remarks were ________ enrage everybody at the meeting.
#12901
A
so as to
B
such as to
C
such to
D
as much as to