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【单选题】
I' m sure the letter won' t arrive in time ______ it is sent by air.
A.if
B.until
C.because
D.unless
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根据网考网移动考试中心的统计,该试题:
1%
的考友选择了A选项
27%
的考友选择了B选项
2%
的考友选择了C选项
70%
的考友选择了D选项
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