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【单选题】

I usually walk to school, ______sometimes I ride a bike.

[ ]

A.
so
B.
and
C.
but
D.
/
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参考解析:
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举一反三

【单选题】—Are you a doctor or a nurse?—________.

A.
I'm a worker.
B.
I'm a teacher.
C.
Yes, I am.
D.
I'm a doctor.