单项选择题

He wants to become ______ a doctor or a teacher.

A．not
B．neither
C．either
D．both
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单项选择题
You had better not ______ there alone.
A．go
B．to go
C．going
D．gone
单项选择题
Seven years has passed ______ I came to America.
A．since
B．from
C．for
D．when
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