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【題目】It may be necessary to stop ______in the learning process and go back to the difficult points in the lessons.
A.at intervals
B.at random
C.at ease
D.at length

【答案】A
【解析】A．at intervals不時；B．at random隨意；C．at ease自由自在；D．at length終于。句意：也許在課堂上有必要在學習過程中時不時地停一下回顧難點，故選A。

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