Question

用适当的介词填空1.____time,he has developed his interest in English.

Answer 1

in the end意思是“终于,最后”,是一个句子成分,修饰整个句子,后面不用加of,如：In the end,it was more than he could bear. (最后,他再也忍不住了.）

at the end of意为“在……的末端/终点/尽头”,在某个时间点的尽头,后面加日期时间.