Listening attentively in class and reviewing in time _______ a sure way to improve your learning, and this is especially true _______ it es to standard tests.A.is, whenB.are, whenC.is, whileD.are, as
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A解析考查动名词作主语和固定句型。动名词作主语，谓语用单数，Listening attentively...是主语，故谓语用单数is，排除B、D；“当提到......”用when it es to...句型。句意“课堂上注意听讲并及时复习是一种提高学习的好方法，这个方法对标准考试特别有用。”故选A。