Do not disturb me. I______letters all morning and have written six so far.

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问题 Do not disturb me. I______letters all morning and have written six so far.

选项 A、write
B、am writing
C、was writing
D、have been writing

答案D

解析 这里考查的是时态。and前后是并列句,后半句是have written是完成时态,前半句也可考虑是完成时态。同时句中有all the morning,强调一上午连续不断地在做某事。因此,此处需要的是现在完成进行时。
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