题目内容
【题目】All the 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
【答案】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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