单项选择题

I ______ English for nine years.

A． am learning
B． learned
C． have learned
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单项选择题
Dad, this is ______ friend, Lin Tao.
A． mine
B． my
C． me
单项选择题
She came into the room while they ______ television.
A． have watched
B． have been watching
C． were watching
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