．The highest award was given to Anna, who _____ so hard on the project for years, and at last her efforts paid off.
A．has workedB．workedC．was workingD．had been working
D
考查時態(tài)，句意;最高獎項被授予安娜，她從事這個項目多年，至少努力沒白費，關(guān)鍵的句子：her efforts paid off.用過去時，而一直努力是發(fā)生在pay off，之前，用過去完成進(jìn)行時。選D。
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