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哦哦非谓语。

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All these gifts must be mailed immediately ____ in time for Chirstmas. A.in order to have received B.in order to receive C so as to be received .D.so as to be receiving. to do /to doing /to be doing /to have done/to be done/ to have been doing/ tohave been doing 什么时候用什么啊...求解
哦哦非谓语。
解题思路: 句意是:所有礼物必须立即寄走,以便于这些礼物可以在圣诞节准时被收到。 用动词不定式的被动语态 。
解题过程:
选C正确。
谓语动词作状语,其逻辑主语是句子的主语,因gifts与receive之间为被动关系,即“礼物被收到”,所以使用被动式。在四个选项中,A、B和D三项都是表示主动,所以均可以排除。答案为C项,so as to=in order to “为的是,以便”,其后接动词原形。例如:
He ran quickly so as to catch the last bus. 他跑得很快以便赶上那末班车。
I left a message so as to be sure of contacting her.我留下了张条子以便与她取得联系。
Listen carefully so as to follow the teacher. 要仔细听才能听懂老师讲的课。

最终答案:略