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 developedB．is being developedC．is developingD．has developed
B

試題分析：句意：一種新的藥物正在被科學(xué)家開發(fā)來治療H7N9禽流感，他們希望他們會在幾個星期后成功。從they are hopeful that they will succeed in a couple of weeks. 可知是正在開發(fā)，而且drug和develop是被被動關(guān)系，選B。
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