that定语从句引导词;在从句中做主语不能省略;if also ,if 连词 这里意思:used when admitting that sth may be true or may happen 用於承认某事可能属实或可能发生.引导一个句子,但是这里被省略了,if also it(Maoist era) was poor and more politically repressive.that 跟第一个that一样
