B,as （ can be thought of as 是情态动词的被动语态）
think of sth as sth 把.看做.can be thought of as 怎么能看出是情态动词的被动语态呢？把原句改为主动句是We can think of the mixture of elements in the air as a solution of gases.
The mixture of elements in the air can be thought of___a solution of gases.
The mixture of elements in the air can be thought of___a solution of gases.
The mixture of elements in the air can be thought of___a solution of gases.
A,to B,as C,over D,about
The mixture of elements in the air can be thought of___a solution of gases.
A,to B,as C,over D,about
英语人气：467 ℃时间：2020-01-29 00:12:13
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