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题目内容
（国家开放大学 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. 此题未答
单选题 (10 分) 0分
A.
thinking
B.
think a lot
C.
to think
单选题 (10 分) 0分
A.
thinking
B.
think a lot
C.
to think
参考答案
