单项选择题

He is a scientist, ______ a singer as well.

A．not
B．or
C．and
D．but
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单项选择题
She has been looking forward ______ her parents.
A．to meeting
B．for meeting
C．being met
D．to meet
单项选择题
______ of the river has been polluted.
A．Second-three
B．Two-three
C．Two-third
D．Two-thirds
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