可以是：　i think it is necessary that +　主语　+　谓语 and that +　主语　+　谓语　（这里两个that 从句都是主语从句（后移的主语从句）.如 I think it is necessary that we do this quickly and that we go t...����˵��ô��������Ӿ䲻�DZ���Ӿ��it Ϊ���дʡ�it is necessary that we dothis = That we do this is necessary��������Ӿ䱻�����ˣ�