单项选择题

They have been trying to find out the identity of the writer of the________letter, but in vain.

A．infamous
B．autonomous
C．anonymous
D．unanimous
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There are many________nowadays in the universities.
A．woman teachers
B．women teacher
C．woman's teachers
D．women teachers
单项选择题
________at from outer space, the Earth is just like a ball hanging in the universe.
A．Having looked
B．Looking
C．Looked
D．Having been looked
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