7．Though he was ______ eight-year-old boy then，he had three big apples at ______ time．（　�。�
A．an； theB．an；/C．aD．an； a

分析 盡管那時他是一個8歲的男孩，但他可以一次吃掉3個大蘋果．

解答 答案：D 根據(jù)關鍵詞was可知這里強調一個男孩應用a，由于緊挨著冠詞的eight的首字母是元音音素，所以冠詞a應變成an； 結合語境應是一次吃掉三個蘋果，強調一次應該用冠詞a，為at a time．故選D．

點評 此題考查冠詞的用法．做題時抓住句中的關鍵詞并結合句意準確判斷出應用哪個冠詞．并要注意細節(jié)，尤其是冠詞后面緊挨的首字母是元音音素的情況．

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