—Must we hand in our exercise books today?
—Yes, _____.
A. you will
B. you must
C. you do
D. you can
A. you will
B. you must
C. you do
D. you can
【答案】
A. you will
B. you must
C. you do
D. you can
A. you will
B. you must
C. you do
D. you can
【答案】
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