题目内容
— I wonder if you can go shopping with me together.
— Sorry. I _____ a letter all the morning and haven't finished it yet.
— Sorry. I _____ a letter all the morning and haven't finished it yet.
[ ]
A. am writing
B. was writing
C. have written
D. have been writing
B. was writing
C. have written
D. have been writing
D
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