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    精英家教网 > 高中英语 > 题目详情
    ____ _ he can pass the driving test is quite uncertain.
    A．If B．WhetherC．ThatD．What
    B

    试题分析：通过分析句子结构，可知这是一个主从复合句，其中包含一个主语从句。if 不能引导主语从句，故排除。引导词在主语从句中不作任何成分，且表示“是否”的含义，故选B。
    点评：在复合句中充当主语成分的句子叫做主语从句。解答这类题目，关键在于分析清楚句子结构。通过判断引导词在从句中所作的成分，来选择正确的引导词。
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