问题
选择题
This is ______ key, and that is ________ orange.
A. a; a B. a; an C. an; an
答案
答案：B
key和orange都是可数名词，前者是辅音因素开头，后者是以元音因素开头，故选B。
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This is ______ key, and that is ________ orange.
A. a; a B. a; an C. an; an
答案：B
key和orange都是可数名词，前者是辅音因素开头，后者是以元音因素开头，故选B。