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基本語法。
1．These toys _____ _____ (make) of metal.
2. Our house _____ _____ (build) in 1995.
3. The telephone _____ _____ (invent) by Alexander Graham Bell in 1876.
4. He _____ _____ (know) to be a great hero.
5. The next boy _____ _____ _____ (ask) to answer another question.
1. are made   2. was built     3. was invented    4. is ( was) known             5. will be asked
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