AnewkindofdrugtocureH7N9birdfl_优题课试题网

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更新 2022-09-03
科目英语
题型单选题
难度中等
浏览 394

A new kind of drug ___ ___ to cure H7N9 bird flu by the scientists and they are hopeful that they will succeed in a couple of weeks.

A．has been developed

B．is being developed

C．is developing

D．has developed

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