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
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

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