皮皮学，免费搜题
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搜题
【单选题】
—Who is playing the piano in the classroom? —_______ must be Susan. She plays the piano after school every day.A.
She
B.
It
C.
This
D.
He
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参考解析：
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皮皮学刷刷变学霸
举一反三
【简答题】(微分公式)d( )=2dx
【单选题】Children ______ to difficult situations are better at handling those _____ tasks.
A.
exposing; challenging
B.
exposed; challenged
C.
exposed; challenging
D.
exposing; challenged