She stepped on my foot _______, not ____
问题:
She stepped on my foot _______, not _______, which made me angry.
A.by chance; on purpose
B.on purpose; by chance
C.for purpose; by chance
D.by chance; for purpose
She stepped on my foot _______, not _______, which made me angry.
A.by chance; on purpose
B.on purpose; by chance
C.for purpose; by chance
D.by chance; for purpose