单选题：Thin-film solar panels do not sell well on market because___

题目分类：理工类
题目类型：单选题
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题目内容：

Thin-film solar panels do not sell well on market because__________. A．their advantages are not well-recognized.
B．they do not work well if exposed to light.
C．the yneed improving in appearance.
D．they are not advertised.

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答案解析：

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