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In the meeting, the professor expressed his thanks for the aid he _________ from his students.
A.receivedB.was receivedC.have receivedD.had received
D
    
试题分析:考查动词时态。根据语境可知获得帮助是发生在动词expressed之前,表示过去的过去,所以用过去完成时,故答案选D。句意:在会议上,教授表达了他对学生们帮助的感激。
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