填空题

______(在三个月内掌握一门外语)is not an easy thing,but he made it.

【参考答案】

Mastering a foreign language within three months
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填空题
My parents always educated me to ______(预留一些钱以备急用).
单项选择题
According to Greenberg,colleges post the courses online for free to______.
A. claim its status in a particular area
B. attract potential students
C. follow the innovation in education
D. share their intellectual property
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