Early.in the morning he opened all the windows ___ in fresh air..Early.in the morning he opened all the windows ___ in fresh air.,.A) so as to letting B) as so to let C) as to so let D) so as to le

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Early.in the morning he opened all the windows ___ in fresh air.
.Early.in the morning he opened all the windows ___ in fresh air.,.
A) so as to letting B) as so to let C) as to so let D) so as to le

so as to + do sth.
表示为了做什么什么
等价于 in order to do sth.
选D

D so as to=in order to “为了……”其后跟动词原形

so as to let

A