I have aleady waited here for ___ hour and ___ half.
A．a(chǎn)n….aB．a(chǎn)….aC．a(chǎn)…..anD．a(chǎn)n….an
A
不定冠詞an用在以念元音開頭的詞之前，a用在以念輔音開頭的詞之前。
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