题目内容
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
C
解析:本题考查了不定式作目的状语的用法。so as to用于句中,且其后的动词和它的句子的主语存在被动关系,需采用不定式的被动形式。
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