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第1题

This book has been in the works so long that I have lost _____of most of the sources found for me by the staff of the li
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第2题

Our civilization cannot be thought of as _____in a short period of time. A、to have been created B、to be created C、hav
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第3题

The millions of circulations involved, _____ by hand, would have lost all practical value by the time they were finished
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第4题

To their credit the Department of Energy _____these ideas and funded a detailed study. A、took over B、took on C、took u
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