The journey takes _____ .
A. half an hour      B.an hour half        C.a half hour
A

試題分析：根據(jù)語境和選擇項的提示可知此句考查的是半個小時的表達方式，因hour的首音素是元音音素，故其前面用不定冠詞時要用an，故選A。
點評：半個小時的表示只能用half an hour。
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