She has 什么 old key A.a B.an C.both

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She has 什么 old key A.a B.an C.both
She has 什么 old key A.a B.an C.both

She has 什么 old key A.a B.an C.both
答案:B.
翻译:她有一把就钥匙.
old为元音音素开头,所以用不定冠词an.
both指两者,这样key必须用复数形式keys才行.