( Found )in the (shells of) lobsters, shrimp, and crabs, glucosamine (is also) present in human cartilage, which (covering )the

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问题 ( Found )in the (shells of) lobsters, shrimp, and crabs, glucosamine (is also) present in human cartilage, which (covering )the bones in joints.

选项 A、Found
B、shells of
C、is also
D、covering

答案D

解析
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