Nothing but grass and trees ______ the hill.

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问题 Nothing but grass and trees ______ the hill.

选项 A、covers
B、cover
C、covering

答案A

解析 but在此句中是介词,相当于except,意为“除……以外”;此种结构中谓语的单复数应与but前的名词或代词相一致。
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