单项选择题

I just don't enjoy ______ in this classroom; it is so crowded.

A． sitting
B． to sit
C． sit
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单项选择题
Nobody but Jane ______ Sam's address.
A． known
B． is known
C． knows
单项选择题
Mary and I bought ______ some oranges.
A． myself
B． herself
C． ourselves
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