Nothing but grass and trees ____the hill .A.covers B.cover C.covering D.is covering ,为什么?

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Nothing but grass and trees ____the hill .A.covers B.cover C.covering D.is covering ,为什么?

Nothing but grass and trees ____the hill .A.covers B.cover C.covering D.is covering ,为什么?
Nothing but grass and trees ____the hill .
A.covers B.cover C.covering D.is covering
,为什么?

Nothing but grass and trees ____the hill .A.covers B.cover C.covering D.is covering ,为什么?
在nothing but中,nothing才是句子真正的主语,but引导的成分只是用来修饰nothing的,所以,谓语cover应与真正的主语nothing一致