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单项选择题


A．dependent
B．a good source of information
C．of great value
D．reliable
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单项选择题A．stillB．alwaysC．habituallyD．consequently

A．still
B．always
C．habitually
D．consequently

单项选择题A．alwaysB．rarelyC．littleD．sometimes

A．always
B．rarely
C．little
D．sometimes