—He deserves it. He _________ a lot before he handed it in.

A. prepared B. prepares

C. had prepared D. has prepared

【答案】C

【解析】句意：---据说John的论文得了A级。---他应该得。它交上他之前准备了很多。题干中hand in的动作发生在过去，prepare又发生在hand in之前，也就是发生在过去的过去，故应用过去完成时。故选C。