题目内容

This is _______ usual way of solving the problem. Can you think of ________ unusual way?
A．a; a B．a; anC．an; anD．an; a
B
本题考查的是不定冠词an和a的用法，当第一次提到某物时，要用不定冠词a或an，第一空后接的usual的首个音标为辅音音标，用不定冠词a，而后一空的unusual的首个音标为元音音标，故用不定冠词an，故选答案为B
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