单项选择题

A．to
B．in
C．at
D．on
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单项选择题
A．whileB．soC．whereasD．where
A．while
B．so
C．whereas
D．where
单项选择题
What are the advantages of artificial languages
A．They are simple.
B．They have no irregular grammatical forms.
C．They have no native speakers.
D．Both A anti B are right.
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