单项选择题

There ______ a great number of ants under the tree.

A． are
B． is
C． /
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单项选择题
—Which room shall we live in tonight — In______.
A． the Room 406
B． Room 406
C． 406 Room
单项选择题
When I was 20 years old I studied in ______ university.
A． /
B． a
C． an
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