[答案]
TheyoftenhaveaschooltripinSeptember.
[解析]
考查陈述句的肯定形式。首先根据所给词汇及标点,可确定组合的句子为一般现在时的陈述句,组合的句意:他们经常在九月份进行学校旅行。They他们,做主语,放于句首;often经常,频率副词,常放于主语后实义动词前;have有,谓语动词,放于副词后;a school trip一次学校旅行,做宾语,放于动词后;in September在九月份,时间介词短语,放于句末,结合整句及英语表达的习惯作答。
故答案为:They often have a school trip in September.
[点评]
本题考查了"陈述句肯定形式,",属于"常考题",熟悉题型是解题的关键。