If you want to understand what life expectancy is decreasing in America, the state of West Virginia may offer some answers.

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问题 If you want to understand what life expectancy is decreasing in America, the state of West Virginia may offer some answers.

选项 A、why
B、that
C、who
D、how

答案A

解析 这句话意思是:如果你想知道为什么美国人的预期寿命在减少,西弗吉尼亚州可能会给出一些答案。此题考查宾语从句,understand为句子谓语,后跟宾语从句,that,who,why,how,what均可引导宾语从句,但根据后文the state of West Virginia may offer some answers可知前句问的是原因,因此选A。
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