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第1题

Modern machinery _______ been installed in this newly-built factory. (A) have (B) has (C) are (D) is
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第2题

When a fire____ at the National Exhibition in London, at least ten priceless paintings were completely destroyed. (A)
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第3题

After driving for thirty miles, she suddenly realized that she （）in the wrong direction. 　　 (A) was driving (B) has
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第4题

he children 　（）　 many times not to play with fire. (A) told (B) have been told (C) have told (D) are being told
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