Lily feels very excited they will have a trip to Mount Wuyi this Sunday.
A. even though B. because C. because of
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解析：A. even though 即使 B. because 因为 C. because of由于；句意：莉莉感到非常兴奋，因为他们这周天将去武夷山旅行。because 因为 ，because of都意为由于，区别在于前者后面接从句，后者不接从句，为介词短语。故选B