This is a apple.It's red错在哪里

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This is a apple.It's red错在哪里
This is a apple.It's red错在哪里

This is a apple.It's red错在哪里
应该是an apple

a 改 an

This is an apple.It's red.
apple 前应该是an.

a改成an apple是以元音开头的