______ , such problems concerning environment protection are not as easy to solv

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问题 ______ , such problems concerning environment protection are not as easy to solve as they look.

选项 A、Speak generally
B、To speak generally
C、Generally speaking
D、General speaking

答案 C

解析有时现在分词可用来表示说话人对所说的话的一种态度，有的已经变成了固定短语，可以看做是一种句子的独立成分或插入语。Generally speaking意为“一般来说”。

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A--NSA(NationalSecurityAgency)(America)B--UNEP(UnitedNationsEnvironment