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职称英语
理工类C级
[单选题]
After 1850,variousstates in the United Statesbegan to pass [compulsory] school attendance laws.
A.harsh
B.diversified
C.mandatory
D.complicated
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![After 1850,variousstates in the United Statesbegan to pass [compulsory] school attendance laws.](https://img.zhaotiba.com/tiku75/15023112.jpg "After 1850,variousstates in the United Statesbegan to pass [compulsory] school attendance laws.")