单项选择题

A) after C) since
B) until D) for

A．after
B．until
C．since
D．for
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单项选择题
A) made C) investigated B) invented D) produced
A．made
B．invented
C．investigated
D．produced
单项选择题
A) essentially C) needlessly B) substantially D) obviou~4y
A．essentially
B．needlessly
C．substantially D) obviou~4y
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