【題目】 All these postcards must be mailed at once in time for the Spring Festival.

A. to have received B. so as to be receiving

C. so as to be received D. to receive

【答案】C

【解析】句意：所有這些賀卡必須立即寄出去，是為了使它們在春節(jié)及時被收到． “receive”和“postcards t”之間是被動關系，所以so as to be received正確。故選C。

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