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