Some researchers believe that there is no doubt _________ a cure for AIDS will be found.
A which
B that
C what
D whether
相关试题
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Some researchers believe that there is no doubt _________ a cure for AIDS will be found.
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ead.There is no cure for AIDS and no vaccine（疫苗）or medicine to prevent it. However, researchers kno
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ead.There is no cure for AIDS and no vaccine（疫苗）or medicine to prevent it. However, researchers kno
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ead.There is no cure for AIDS and no vaccine（疫苗）or medicine to prevent it. However, researchers kno
-
ead.There is no cure for AIDS and no vaccine（疫苗）or medicine to prevent it. However, researchers kno