问题
选择题
—Could you please do some shopping for me, Mary?
—Sorry, I ______ my homework. [ ]
A. do
B. am doing
C. have done
D. was doing
答案
答案：B
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—Could you please do some shopping for me, Mary?
—Sorry, I ______ my homework. [ ]
A. do
B. am doing
C. have done
D. was doing
答案：B