Only ___in my forties a purpose in life.

Only ___in my forties a purpose in life.
A、I did find
B、I found
C、found I
D、did I find
【正确答案】：A
【题目解析】：Only ”只有“ 提前时，要引起倒装，found 是实义动词，因此要借用助动词did，因此答案选A