Richer regions, especially some coastal developed provinces, should do _______ they can _______ poorer areas.A.what; helpB.all what; helpC.whatever; to helpD.no matter what; to help
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C解析句意为“富裕地区，尤其是沿海的一些发达省份，应当尽力帮助那些较穷的地区”。do whatever they can之后省略了do，其后的to help为不定式作目的状语。而D项中no matter what不能作宾语。