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We believe ________ we can find out the wonder drugs to H7N9 bird flu.

A.when B.whether C.what D.that

 

D

【解析】考查名词性从句。句意为:我们相信,我们能够找到治疗H7N9禽流感的药物。根据“believe”及语境可知,believe后接宾语从句,且为陈述句,故用that引导,因此D项正确。A、B、C三项都接疑问句,均不符合语境,故排除。

 

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