Unit 3 is too difficult for him to understand.(同义句) Unit 3 is （）_英语解答

Unit 3 is too difficult for him to understand.(同义句) Unit 3 is （）difficult ( )he can not
我写在下面了:understand it

人气：488 ℃　时间：2020-09-26 19:54:56

解答

应该填写
so that
单元3如此得难,以至于他不能理解