◎ 题干
All these gifts must be mailed immediately _____ in time for Christmas.
[     ]
A. in order to have received
B. in order to receive
C. so as to be received
D. so as to be receiving
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“All these gifts must be mailed immediately _____ in time for Christmas. [ ]A. in order to have received B. in order to receiveC. so as to be received D. so …”主要考查了你对  【介词和介词短语】【不定式的被动式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。