21．Is that lion or elephant?A．an.an B．a.a C．a.an D．an.a——青夏教育精英家教网——

摘要：21．Is that lion or elephant?A．an.an B．a.a C．a.an D．an.a

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Is that ________ lion or ________ elephant?

A．an，an B．a，a C．a，an D．an，a

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