问题
选择题
— Shall we go out for a walk?
— Sorry, I can't. I ______ my homework. [ ]
A. do
B. did
C. am doing
D. was doing
答案
答案：C
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— Shall we go out for a walk?
— Sorry, I can't. I ______ my homework. [ ]
A. do
B. did
C. am doing
D. was doing
答案：C