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Thesilkyprotectivecasespunbythelarvaeofsome...请问此句中spin为什么一定要以过去时用?Cocoon:thesilkyprotectivecasespunbythelarvaeofsomeinsectsandmothsinwhichtheymetamorphose,thepupa.

题目详情
The silky protective case spun by the larvae of some...请问此句中spin为什么一定要以过去时用?
Cocoon:the silky protective case spun by the larvae of some insects and moths in which they metamorphose,the pupa.
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答案和解析
因为他是过去分词作定语,必须用.