【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 考查介詞短語(yǔ)辨析。A．at intervals 不時(shí)；B．at random隨意的；C．at ease自在的；D．at length詳盡地；句意：可能有必要學(xué)一定的內(nèi)容再停下來回顧一下本課的難點(diǎn)。根據(jù)語(yǔ)境可知選A項(xiàng)。

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