Sheep are important tamed animals because they provide food and clothing;（）, they are used in making other products such as so, and glue. 选项 A: should have stayed B: had stayed C: was to stay D: must stay

Sheep are important tamed animals because they provide food and clothing;（）, they are used in making other products such as so, and glue.
选项
A: should have stayed
B: had stayed
C: was to stay
D: must stay

出自：综合英语

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