单项选择题

On no account be removed from the library.

A．reference books may
B．may reference books
C．can't reference books
D．reference books can
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单项选择题
—Your uncle told me that he overslept this morning. —Oh, my uncle rarely used to oversleep,
A．wasn't he
B．was he
C．didn't he
D．did he
单项选择题
What happens when sea water touches different elements another subject of study.
A．are
B．is
C．have been
D．was
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