单项选择题

It was unusual for there ______ so few students in the classroom.

A．to be
B．be
C．being
D．are
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单项选择题
Such euphemisms may be stylistically permissible if they are kept within______.
A．boundaries
B．ranges
C．borders
D．limits
单项选择题
The words Francis Key wrote on the back of an old letter The Star Spangled Banner became the national ______ of the United States.
A．song
B．hymn
C．anthem
D．motto
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