look at the smoke ____the air.A in B on C of D at

问题描述:

look at the smoke ____the air.A in B on C of D at

选择 in 喔.
in the air.空气中的烟雾.
直观一点说:on 是在……之上;of 是……的;at 是在……边上,只有跟地点的时候表示在……地方.