填空题

China should lose no time (catch) ______ up with the developed countries.

【参考答案】

catching
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填空题
Textbooks are used (teach) ______ us how to acquire knowledge.
单项选择题
A．He’s prepared for it.B．He missed it.C．It will be difficult.D．He doesn’t worry about it.
A．He’s prepared for it.
B．He missed it.
C．It will be difficult.
D．He doesn’t worry about it.
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