This is a apple.That's a pear.改错.

This is a apple.That's a pear.改错.
This is a apple.That's a pear.改错.

This is a apple.That's a pear.改错.
This is an apple.That's a pear.

This is an apple. That's a pear.

This is an apple. That's a pear.

This is an apple. a改成an ,元音音素前面用an
第二个句子没有错误.
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