英语选择题：Maywe leave the class now? No,you____.you____to leave until the bell rings.急急急急急急a.must not;are allowedb.have to;are supposedc.need not;are not allowedd.can not;are not supposed

英语选择题：Maywe leave the class now? No,you____.you____to leave until the bell rings.急急急急急急
a.must not;are allowedb.have to;are supposedc.need not;are not allowedd.can not;are not supposed