ASMO Asian English Olympiad 2022 — Level 1 — Grade 1–2 — School Category Câu hỏi 6

ASMO English · ASMO Asian English Olympiad 2022 — Level 1 — Grade 1–2 — School Category

Câu hỏi 6

She has been waiting __________ an hour at the bus station.

1. in
2. for
3. Until
4. since