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:
so as to后接动词原形,表示“以便”。根据gift与receive的关系可判断出要用to be done的形式,表示被动。
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