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

Awhen Bwhether

Cwhat Dthat

 

D

【解析】D 考察名詞性從句。Believe后面接賓語從句,且為陳述句,故使用that引導(dǎo)。D項正確。ABC都接疑問句。

 

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