单项选择题
A.is
B.signals
C.stands for
D.indicates
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单项选择题
A.withinB.withC.fromD.less
A.within
B.with
C.from
D.less
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单项选择题
A.passingB.passedC.has passedD.had passed
A.passing
B.passed
C.has passed
D.had passed
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