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.
单选题 (10 分) 10分
A.
thinking

B.
think a lot

C.
to think
出自:国家开放大学人文英语(3)

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块