—Susan, what are the advantages of MP5 players?—Mom, they are smaller and lighter ______ they can be carried very easilyA.unlessB.ifC.untilD.so that
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D解析unless除非，如果不；if是否，如果；until 直到；so that以便，所以。句意：苏珊，ＭＰ５播放器的优势是什么？——妈妈，它们更小更轻便，所以它们携带非常方便。结合语境可知前后是因果关系，故选Ｄ。考点：连词辨析