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
网友回答
A. in order to have received
B. in order to receive
(答案→)C. so as to be received
D. so as to be receiving
解析：句意：所有的这些礼物必须马上被寄出，为了及时让这些圣诞节的礼物被收到。这里用so as to与in order to都可以表示目的，又因为gifts与receive之间是被动关系，故选C。