Disease can be______, if not more so, to the well-being and progress of a nation

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问题 Disease can be______, if not more so, to the well-being and progress of a nation than wars or economic depressions.

选项 A、as harmful as
B、harmful
C、as harmful
D、harmful as

答案 C

解析语法类试题(比较级)。as…as…“与……一样”，表示同级比较；more…than…“比……更……”，表示比较级。be harmful to…意思是对……产生危害，据此可以排除A、D，因为句中有插入语if notmore so。所以应用比较级，选C。

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