Understanding the cultural habits of another nation, especially one containing so many diversified subcultures as the US, are a

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问题 Understanding the cultural habits of another nation, especially one containing so many diversified subcultures as the US, are a complex, bewildering task to us.

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答案are——is

解析 此句的主语并非subcultures,而是句子开首的understanding,故相应的谓语动词应该用单数形式is。
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