I had to refuse their invitation to take part in the trip because my father didn't allow me to go. (turn)

=> I had to turn down their invitation to take part in the trip because my father didn't allow me to go.

Giải thích: từ turn down bằng nghĩa với từ refuse nghĩa là từ chối

CHÚC BẠN HỌC TỐT

$-$ I had to refuse their invitation to take part in the trip because my father didn't allow me to go.

$→$ I had to turn down their invitation to take part in the trip because my father didn't allow me to go.

*Cấu trúc:
- refuse = turn down (v.): từ chối.

- have to/ has to + V (Bare): phải làm gì.

- take part in (v.): tham gia.

*Translate: Tôi đã phải từ chối lời mời của họ để tham gia chuyến đi vì cha tôi không cho phép tôi đi.