不可以,强调句中的这两个连词是绝对不能省略的.His writing is so confusing that it's difficult to make out what it is he is trying to express.这是安徽省2011年高考题，为什么what it is后面没有that?这不是强调句吗？这个不是强调句。首先一个so...that 句型，这个你应该看明白了。接下来是个it is + adj+to do的句型what it is he is trying to express 这是个定语从句，本来的句子应该是：he is trying to express is what，it 这里是个代词代替he is trying to express.这句话的；由于这个句子又要做make out 的宾语从句，把本来的特殊疑问句 what is it？变成了宾语从句的陈述语序，就出现了what it iswhat it is he is trying to express 我觉得这个是宾语从句吧，做make out 宾语；如果是定语从句，没有先行词。嗯，我理解错误了。应该是这样理解才对，it作为形式主语代替后面的句子he is trying to express,那么这个宾语从句就是 what he is trying to express is.