—Excuse me, is this your backpack? —____
问题:
—Excuse me, is this your backpack?
—_____[ ]
A. Sorry, I don't know
B. Yes, it is. Thank you
C. Your backpack is in my room
D. It's black
—Excuse me, is this your backpack?
—_____[ ]
A. Sorry, I don't know
B. Yes, it is. Thank you
C. Your backpack is in my room
D. It's black