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【单选题】

He will be back_____3 days.
[ ]

A.
on
B.
at
C.
for
D.
in
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参考解析:
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【单选题】-What does your mother do?-_____________[ ]

A.
She is a teacher.
B.
She is fifty.
C.
She likes reading.
D.
She works in a hospital.