单项选择题

A．They should watch the clock carefully.
B．They should be careful of their handwriting.
C．They should finish their assignment early.
D．They should hand in their homework next week.
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单项选择题
A．To eliminate swimming entirely.B．To limit boating and fishing.C．To limit phosphate detergents.D．To kill all alga
A．To eliminate swimming entirely.
B．To limit boating and fishing.
C．To limit phosphate detergents.
D．To kill all alga
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