Indigo is a vat color,______ called because it does not dissolve in water.A、whic

游客2023-11-14  9

问题 Indigo is a vat color,______ called because it does not dissolve in water.

选项 A、which it
B、it is
C、but
D、so

答案 D

解析 so是一个副词,意思是“这样地”。
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