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Don’t interrupt me. I ________ letters all morning and have only finished five.
A.writeB.have writtenC.have been writingD.am writing
C
考查时态。句意:别打扰我,我一上午都在写信,到现在才写好五封。现在完成时表示从过去某一时间开始的动作一直到现在还在继续。
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