(35) The main problem was in that I always thought in Chinese… (去掉 in,was 后是一个由 that 引导的宾语从句,in 是多余的) (全国卷)
(36) I followed her advice and should put down 100 words or so each day. (去掉 should,因 put 和 followed 是平行结构,作并列谓语) (全国卷)
(37) When I was a boy, the most exciting thing was when to celebrate the Spring Festival. (去掉 when,根据句意,此处无需加疑问词) (江苏卷)