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Mary is a humorous and warm-hearted woman and that is she is a most popular person in her community．

A．why

B．because

C．how

D．whether

試題分析：句意：瑪麗是一個幽默和熱心的女人，這就是為什么她在她的社區中很受歡迎的原因。A．why在表語從句中意為：……的原因；B．because在表語從句中意為：這是因為……；C．how問方式； D．whether意為是否。結合句意可知，選A。
考點: 考查連接詞的用法。

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