单项选择题

A．at which
B．by which
C．for which
D．to which
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单项选择题
A．modernB．smallC．advancedD．beneficial
A．modern
B．small
C．advanced
D．beneficial
单项选择题
A．primarilyB．probablyC．previouslyD．consequently
A．primarily
B．probably
C．previously
D．consequently
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