短語詞組短語I must be off 我得離開;我必須得走了she must be off now 她現(xiàn)在必須離開了I must be off soon 我很快就得走Work must be off before 工作之前必須先斷電I must be off now 我現(xiàn)在必須得走了It must be the laid -off 必須到崗 返回 must be off