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

    分析 她是否能够按时完成任务存在疑问．

    解答 答案是B．
    本题考查名词性从句的引导词；题干中名词doubt后接从句说明了doubt的内容，为同位语从句；if 不引导同位语从句，故排除C；doubt表示疑问或不确定，that表示确定的信息，故排除A；根据句意，她"是否"能够按时完成任务存在疑问，wheterh表示"是否"，可以引导各种名词性从句，故答案是B．

    点评 名词性从句考查的关键是连接词的选用和语序，因此，我们首先要搞清从句的性质，掌握各连接词的用法，在此基础上判断．此外，关注名词性从句用陈述语序．
    doubt后面接同位语从句时，用在否定句中，后面接that引导的同位语从句． 
    例如：I have no doubt that he will succeed．
    我相信他会成功的．
    doubt用在肯定句中，后面接whether引导的同位语从句．注意不可以用if替换whether．
    例如：He had his doubts whether they would give him another chance to have a try．
    他不能肯定他们是否会再给他一次机会试一试．
    There is some doubt whether their football team will win the match．
    他们的足球队会不会赢得这场比赛还不能肯定．

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