有关于非谓语动词36

A.spending
Britain is the only nation in the developed world( ____ a smaller part of its wealth on scientific research than 10 years ago )
括号内是定语，修饰nation , 后面的spend 是nation 做的，所以用主动的现在分词。等于：定语从句 which spends.....
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c 中间省略 which

Britain is the only nation in the developed world 是主句
（省略which or that）spends a smaller part of its wealth on scientific research than 10 years ago 这里时态是现在时 因此选C

A.
选择C绝对是错误的，把它看成定语从句的话，从句中缺少主语，关系代词不能省略。应该选择A。这题考察非谓语动词，V-ING形式表主动进行，题中主语和动作构成主动关系，所以用V-ING选项。

你首先要知道这句话的完整形式,Britain is the only nation in the developed world which spends a smaller part of its wealth on scientific research than 10 years ago .此处which 省略,这时spends 也必须相应的变为非谓语形式 spending,它的语法意义是做中心词nation的后置定语, 否则句中会出现两个谓语动词,这是严重的语法错误.