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.mustnot;areallowedb.haveto;aresupposedc.neednot;arenotallowedd.cannot;arenotsuppose...
a.must not;are allowedb.have to;are supposedc.need not;are not allowedd.can not;are not supposed
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