问题
选择题
Do not disturb me. I ________ letters all morning and have written ten so far. [ ]
A. write
B. have been writing
C. have written
D. was writing
答案
答案：B
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Do not disturb me. I ________ letters all morning and have written ten so far. [ ]
A. write
B. have been writing
C. have written
D. was writing
答案：B