Mr Smith is giving a talk___air and water.A.onB.forC.inD.at

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MrSmithisgivingatalk___airandwater.A.onB.forC.inD.atMrSmithisgivingatalk___airandwater.A.onB.forC.in

Mr Smith is giving a talk___air and water.A.onB.forC.inD.at
Mr Smith is giving a talk___air and water.
A.on
B.for
C.in
D.at

Mr Smith is giving a talk___air and water.A.onB.forC.inD.at
此题选 A.on
give a talk on 作...报告
此题意思是 史密斯先生正在做关于空气和水的报告.

A吧

我觉得 选 A

A.关于的意思,相当于about

A on是关于的意思

A

A on, 有“关于”的意思

A