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1 . He regretted ________ (miss) his daughter’s school play, as it was a special moment he couldn't get back. (所给词的适当形式填空)
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2 . In 1972, after ________ (fail) more than 190 times, Tu finally made an extract called qinghaosu that was effective against malaria. (所给词的适当形式填空)
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