Use the given suggestions to complete each sentence of the following letter (10p)
I / sorry / it take / so long / reply / letter.




A.I'm sorry it has taken so long to reply to your letter.
B.I'm sorry it has been taking so long to reply to your letter.
C.I'm sorry it has taken so long to reply for your letter.
D.I'm sorry it has taken so long for reply to your letter.

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