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