it's the safer than --------by plane.A.go B.going C.to go D.to going

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it''sthesaferthan--------byplane.A.goB.goingC.togoD.togoingit''sthesaferthan--------byplane.A.goB.goin

it's the safer than --------by plane.A.go B.going C.to go D.to going
it's the safer than --------by plane.A.go B.going C.to go D.to going

it's the safer than --------by plane.A.go B.going C.to go D.to going
B than介词后加ving

by by by by 全都填by 都填by 搭乘；by 交通工具基本的简单It

选B， than+doing