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
so as to在句中等于in order to,后接动词原形,表示“以便”,但不能置于句首。根据gift 与receive 的关系可判断出要用to be done 。
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