【題目】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后接動(dòng)詞原形，表示“以便”，根據(jù)gift與receive的關(guān)系可判斷出要用to be done的形式；表示被動(dòng)。

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