She ____letters all morning and felt tired.A has been writing B writes C had been writing D has written

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She ____letters all morning and felt tired.A has been writing B writes C had been writing D has written

She ____letters all morning and felt tired.A has been writing B writes C had been writing D has written
She ____letters all morning and felt tired.
A has been writing B writes
C had been writing
D has written

She ____letters all morning and felt tired.A has been writing B writes C had been writing D has written
C had been writing
语法:过去完成进行时态 其中的标志词语就是all morning