ChinesescientistsonTuesdaythat

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Chinese scientists ______ on Tuesday that they ______ a low-cost welding robot, which can help improve welding efficiency for small factories.

A．announces; had invented	B．announced; have invented
C．announced; had invented	D．announces; have invented

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A．used to stay	B．was used to stay
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-- Hey! Do you know Bulls’ Derrick Rose becomes the youngest NBA MVP?
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A．have polluted	B．is being polluted
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As time went by, I eventually found Mary and I had ________.

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