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

A．when B．whether C．what D．that

 

D

【解析】考查名詞性從句。句意為：我們相信，我們能夠找到治療H7N9禽流感的藥物。根據(jù)“believe”及語境可知，believe后接賓語從句，且為陳述句，故用that引導(dǎo)，因此D項(xiàng)正確。A、B、C三項(xiàng)都接疑問句，均不符合語境，故排除。

 

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