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单项选择题

A．that
B．which
C．all
D．what
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热门试题

单项选择题A．sourcesB．originsC．resourcesD．materials

A．sources
B．origins
C．resources
D．materials

单项选择题A．sinceB．owing toC．on condition thatD．in case

A．since
B．owing to
C．on condition that
D．in case