摘要：This is apple .That is orange .

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This is ________ apple, and that is ________ orange.

A. a; a B. a; an C. an; an D. an; a

This is ________ apple, and that is ________ orange.

A. a; a B. a; an C. an; an D. an; a

This is apple, and that is orange.

This is ______ apple, and that is ______ orange.