题目

In spite of the tight schedule of study, the activities for students to achieve their potential have never been _______. A. called in　　　　　　　B. called off                C. called out　　　　   D. called up 答案：B 【解析】句意：尽管学习安排很紧，但开发学生潜能的活动从未被取消过。call in召来；call off取消；call out大声呼叫；call up给……打电话。根据句意可知，B项正确。

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