It's better to read---- than to read silently

问题描述:

It's better to read---- than to read silently
A more aloud
Balouder
Caloud

如果D项是louder,就选D.
aloud没有比较级,所以A、B都是错的.但C也不太好,因为句中有than,又要求用比较级.
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