题目内容

It ____ (动词的合适形式)him(花费了某人多长时间) 10 days to make this model.

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Don't forget to make a contribution ____ (介词)(为 ...... 做出贡献) your country when you return.

Known as a famous writer, J. K. Rowling(J. K.罗琳)is known ____ (介词)(为谁所知) many young readers.

The teenagers are crazy ____(介词)(疯狂迷恋某人)the young pop singer, Justin Bibber(贾斯汀·比伯).

We should do our best to prepare ____ (介词)(为 ...... 做准备) the final exam.

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