问题描述：
30．Students are to develop good study and living habits in schools．
30．Students are ____ to develop good study and living habits in schools．
A．hoped B．reminded C．suggested D．demanded请解释A&B
30．Students are ____ to develop good study and living habits in schools．
A．hoped B．reminded C．suggested D．demanded请解释A&B
问题解答：
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