____ _ he can pass the driving test is quite uncertain.
A．If B．WhetherC．ThatD．What
B

試題分析：通過分析句子結(jié)構(gòu)，可知這是一個主從復合句，其中包含一個主語從句。if 不能引導主語從句，故排除。引導詞在主語從句中不作任何成分，且表示“是否”的含義，故選B。
點評：在復合句中充當主語成分的句子叫做主語從句。解答這類題目，關(guān)鍵在于分析清楚句子結(jié)構(gòu)。通過判斷引導詞在從句中所作的成分，來選擇正確的引導詞。
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