( ) Friends of the Earth can keep the environment ____.A.cleaned B.clean C.cleaning D.cleanly

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()FriendsoftheEarthcankeeptheenvironment____.A.cleanedB.cleanC.cleaningD.cleanly()FriendsoftheEarthc

( ) Friends of the Earth can keep the environment ____.A.cleaned B.clean C.cleaning D.cleanly
( ) Friends of the Earth can keep the environment ____.A.cleaned B.clean C.cleaning D.cleanly

( ) Friends of the Earth can keep the environment ____.A.cleaned B.clean C.cleaning D.cleanly
选B keep 是系动词 后面跟形容词 直接用clean

选B keep 后面+形容词表示一种状态

正确:B clean在此作形容词使用,表示“干净的”意思。