(造句)has prevented me / that this difficult task / to your letter / I am sorry / from sending an earlierreply
I am sorry that this difficult task has prevented me from sending an earlier reply to yourletter.
(造句)has prevented me / that this difficult task / to your letter / I am sorry / from sending an earlierreply
I am sorry that this difficult task has prevented me from sending an earlier reply to yourletter.