单项选择题


A．for which
B．in which
C．to which
D．by which
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单项选择题
A．LimitationsB．GapsC．DifferencesD．Breaks
A．Limitations
B．Gaps
C．Differences
D．Breaks
单项选择题
A．averageB．standardC．stageD．condition
A．average
B．standard
C．stage
D．condition
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