—Susan, what are the advantages of MP5 players?
—Mom, they are smaller and lighter ______ they can be carried very easily.
A．unlessB．if C．untilD．so that
D
unless除非，如果不；if是否，如果；until     直到；so that以便，所以。句意：蘇珊，ＭＰ５播放器的優(yōu)勢是什么？——媽媽，它們更小更輕便，所以它們攜帶非常方便。結(jié)合語境可知前后是因果關(guān)系，故選Ｄ。
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