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【B1】 [br] 【B7】A、naturalB、essentialC、functionalD、optionalBsome research activ
【B1】 [br] 【B7】A、naturalB、essentialC、functionalD、optionalBsome research activ
游客
2023-06-25
55
管理
问题
【B1】 [br] 【B7】
选项
A、natural
B、essential
C、functional
D、optional
答案
B
解析
some research activity is essential 某些研究活动还是必不可少的。
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