判断不定冠词选什么,应考虑该不定冠词后的第一个单词的第一个音素是否为元音.useful的音标是[ˈju:sfl],第一个音素是[ j ],非元音音素,所以用a.不用an.
这是学大老师评讲教的.因为我也错了.
This is ______ useful book. A. a B. an C. the D/
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