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?(介词)

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We’re selecting ten causes---from supporting poor families________the environment---and giving you a chance to vote for your favorite. A.to save B.to saving C.saving D.saved 为什么是B不是A?
?(介词)
解题思路: from ... to ... 词组中 from 和 to 都是 介词
解题过程:
We’re selecting ten causes---from supporting poor families________the environment---and giving you a chance to vote for your favorite.
A.to save B.to saving C.saving D.saved
句意:我们精选了10个事业---从支持贫困家庭到拯救环境,并且给你个机会投票选你最喜爱的。
from ... to ... 从......到...... from 和 to 都是 介词 ,后面跟 名词、代词、动名词, 如:
from Beijing to Nanjing 从北京到南京 (名词)
from this one to that one 从这个到那个 (代词)
He did many good deeds from helping the blind to protecting surroundings.
他做了好多好事,从帮助盲人到保护环境。
to 不是不定式 所以不能选A.
最终答案:略