单选题：After getting the books,what did the man do?

题目内容：

After getting the books,what did the man do? A．Checked them out.
B．Took notes on them.
C．Returned them to the shelves.
D．Put them in his book bag.

参考答案：

答案解析：

One of the challenges to build an interactive digital textb

One of the challenges to build an interactive digital textbook from the ground

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