The fat-soluble vitamins are stored in body fat and may therefore accumulate in quantities______.

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问题 The fat-soluble vitamins are stored in body fat and may therefore accumulate in quantities______.

选项 A、can be toxic
B、they can be toxic
C、can they be toxic
D、that can be toxic

答案D

解析 That can be toxic is an adjective clause that modifies quantities.
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