[答案]
Howmanystudentsweretherethirtyyearsago?
[解析]
首先根据所给词汇及标点,可确定组合的句子为一般过去时的特殊疑问句,组合的句意:三十年前有多少学生?How many students 多少学生,特殊疑问词组,提出疑问,放于句首;were there 有,引导一般疑问句,放在特殊疑问词后;thirty years ago三十年前,是时间状语,放于句末,结合整句及英语表达的习惯作答。
故答案为:How many students were there thirty years ago?
[点评]
本题考查了"how many引导的特殊疑问句,",属于"基础题",熟悉题型是解题的关键。