One of the（）to build an interactive digital textbook from the ground up is that is takes a great deal of manpower._精华吧

One of the（）to build an interactive digital textbook from the ground up is that is takes a great deal of manpower.

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One of the（）to build an interactive digital textbook from the ground up is that is takes a great deal of manpower.

A.challenges

B.objections

C.investigations

D.conversations

正确答案：challenges

Tag：大学英语时间：2022-01-27 21:31:21

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