(2013海南三亚)—Susan，what are the advantages of MP5 players？ —Mom，they are smaller and lighter________th...
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题目内容：
(2013海南三亚)—Susan，what are the advantages of MP5 players？
—Mom，they are smaller and lighter________they can be carried very easily．
A. unless
B. if
C. until
D. so that
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