19．There is some doubt ________ she can finish the task on time．（　　）
A．thatB．whetherC．ifD．which

分析 她是否能夠按時完成任務(wù)存在疑問．

解答 答案是B．
本題考查名詞性從句的引導(dǎo)詞；題干中名詞doubt后接從句說明了doubt的內(nèi)容，為同位語從句；if 不引導(dǎo)同位語從句，故排除C；doubt表示疑問或不確定，that表示確定的信息，故排除A；根據(jù)句意，她"是否"能夠按時完成任務(wù)存在疑問，wheterh表示"是否"，可以引導(dǎo)各種名詞性從句，故答案是B．

點評 名詞性從句考查的關(guān)鍵是連接詞的選用和語序，因此，我們首先要搞清從句的性質(zhì)，掌握各連接詞的用法，在此基礎(chǔ)上判斷．此外，關(guān)注名詞性從句用陳述語序．
doubt后面接同位語從句時，用在否定句中，后面接that引導(dǎo)的同位語從句． 
例如：I have no doubt that he will succeed．
我相信他會成功的．
doubt用在肯定句中，后面接whether引導(dǎo)的同位語從句．注意不可以用if替換whether．
例如：He had his doubts whether they would give him another chance to have a try．
他不能肯定他們是否會再給他一次機會試一試．
There is some doubt whether their football team will win the match．
他們的足球隊會不會贏得這場比賽還不能肯定．

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