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He told us he _____ a concert _____ .
A．had attended ... three days beforeB．a(chǎn)ttended ... three days ago
C．would attend ... since three daysD．was attending ... for three days

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The new Hukou(戶口) policy, according to some experts, ______ to attract more high-end talents to contribute to Shanghai’s development.
A．servesB．servingC．to serveD．is served

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Before the coming YSL auction, the Christie’s Auction(拍賣) Company had advertised all of the articles ______ including the Chinese heads of Rabbit and Rat.
A．having soldB．to be soldC．sellingD．sells

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Scientists ______ SARS for several months before a major discovery was made in the field.
A．had been studyingB．have been studying
C．have studiedD．a(chǎn)re studying

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The task _____ more difficult than we expect.
A．proved toB．proved usC．was provedD．proved

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Some teenagers _______ their health because they often expose themselves to so many electric products.
A．have damaged B．a(chǎn)re damagingC．damagedD．will damage

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30. The subway __________in our city, and I’m sure there will be fewer traffic jams in the future.
A．is buildingB．is builtC．is being builtD．will build

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What I said and did at your house last night_________just between you and me.
A．isB．a(chǎn)reC．have beenD．had been

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The price_________recently. I wonder whether it will remain so.
A．was going upB．went upC．has gone upD．has been going up

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What an accident! If the driver_________ carefully, things would not be as they are.
A．has drivenB．droveC．had drivenD．was driving

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