Christmas ________ important festival in the USA.
A. is a    B. is an   C. are a   D. are an
B

試題分析：句意：在美國，圣誕節(jié)是一個重要的節(jié)日。結(jié)合語境可知本句中泛指任何一個重要節(jié)日，故謂語動詞用單數(shù)，important詞首音素是元音，故不定冠詞用an，選B。
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