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第1题

Air cannot be an element _____ an element cannot be separated. A. in that B. except that C. but that D. now that
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第2题

Copper as well as most metals _____ of electricity, but wood is a poor one. A. is a good conductor B. are good condu
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第3题

The traditional approach _____ with complex problems is to break them down into smaller, more easily managed problems.
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第4题

Building that railway was very difficult and involved _____ ten tunnels. A. dig B. throwing C. to have thrown D
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