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[单选题]
Mary opened the package which _______ that morning.(1分)
A
had received
B
received
C
had been received
D
would have been received
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参考答案
试题答案：
C
答案解释：
解题思路： 本题考查动词时态和语态的综合用法。根据题意“玛丽打开了早上收到的那个包裹”。receive这个动作发生在opened这个动作之前，故应该用过去完成时，B)和D）选项应排除。package和receive之间的关系为被动关系，故正确答案为C）选项。
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