请帮忙分析一下这个句子,有关that的使用?
the chinese government has all along made it clear that it is an internal affair of China to decide on what method to use to resolve the Taiwan issue and that we have no oligation to commit ourselves to rule out the use of force .
后半句中“and that...”引导的是否是make it clear 宾语从句,为什么不直接说 we have.,而要加that 呢?