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题目内容
（综合英语）
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
选项
A: should have stayed
B: had stayed
C: was to stay
D: must stay
参考答案
