Listening attentively in class and reviewing in time a sure way to improve your learning

问题补充：

Listening attentively in class and reviewing in time a sure way to improve your learning, and this is especially true it comes to standard tests.

A. is, when

B. are, when

C. is, while

D. are, as

答案：

(答案→)A. is, when

B. are, when

C. is, while

D. are, as

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 comes 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。