Don’t disturb me. I ______ letters all the morning and have written ten so far.
A．writeB．was writingC．have writtenD．have been writing
Ｄ
考查時(shí)態(tài)。本題的關(guān)鍵詞是時(shí)間狀語(yǔ)all the time一直。該時(shí)間狀語(yǔ)通常與現(xiàn)在完成進(jìn)行時(shí)連用。句意：不要煩我，我一直在寫信，到目前為止已經(jīng)寫了10封了�，F(xiàn)在完成進(jìn)行時(shí)表示一直在做某事，強(qiáng)調(diào)動(dòng)作的持續(xù)性和反復(fù)性。故D正確。
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