Those experienced doctors in our country _______the meeting in order to find out the real_______  of bird flu(禽流感).
A．a(chǎn)ttended; causeB．joined; reasonC．joined; causeD．a(chǎn)ttended; reason
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By the time he realizes he _____ into a trap, it'll be late for him to do anything about it．
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 Mr. Smith stood beside the window, his attention ____ the car outside. 
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.  Three-fourths of the buildings ______.
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