Vitamins are complex __ that the body requires in very small amounts.

分类: 作业答案 • 2022-01-13 12:06:38

问题描述：

Vitamins are complex __ that the body requires in very small amounts.
A、matters B、 materials C、 particles D、 substance
为什么选D?请翻译整句

答

维他命是身体内所需的少量复杂的物质