All these gifts must be mailed immediately ________ in time for Christmas.
A.in order to have receivedB.in order to receiveC.so as to be receivedD.so as to be receiving在线课程C
解析：
解析：所有的礼物应立即被寄出去，当然是为了使它们及时被收到．“in order to”和“so as to”都表目的，但“receive”和“gift”之间应是被动关系，所以so as to be received对．命题立意：表目的时so as to不能放在句首，in order to可以，这一点也应记住．同时还应记住 in order，so that引导的状语从句的用法．