When she got to the party, everyone was dancing and singing.
Giải thích
Đáp án: On her arrival at the party, everyone was dancing and singing.
On her arriving at the party, everyone was dancing and singing.
On her getting at the party, everyone was dancing and singing.
Giải thích:
On + N/V-ing = When S + V: Khi…
Dịch: Khi cô ấy đến bữa tiệc, mọi người đang nhảy múa và ca hát.