科目: 来源: 题型:029
用括号内单词的适当形式填空
The key to my bike __________ (leave) at school, so I have to take the bus to school today.
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科目: 来源: 题型:029
用所给动词的正确形式填空
The printing ______ (invent) in China by a man named Bi Sheng.
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科目: 来源: 题型:029
用所给动词的正确形式填空
Information can ______ (keep) on CD-ROMs or machines such as MP3 players.
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科目: 来源: 题型:029
根据括号内所给词的适当形式填空。
Why do many old books have to ________ (keep) away from the public?
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