In the meeting, the professor expressed his thanks for the aid he _________ from his students.
A．receivedB．was receivedC．have receivedD．had received
D
    
試題分析:考查動(dòng)詞時(shí)態(tài)。根據(jù)語境可知獲得幫助是發(fā)生在動(dòng)詞expressed之前，表示過去的過去，所以用過去完成時(shí)，故答案選D。句意：在會(huì)議上，教授表達(dá)了他對(duì)學(xué)生們幫助的感激。
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