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
in order to,so as to都表示“为了”,但此处后面的receive和主语gifts为被动关系,应用不定式的被动式,故只可选C项。
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