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题目内容
（国家开放大学-法学本科-人文英语3）
Quizzes are part of the lecture program to keep students engaged and keep them _________, for students to be able to check that they understood what was covered.
选择一项：
A. thinking
B. think a lot
C. to think
选择一项：
A. thinking
B. think a lot
C. to think
参考答案
