Mrs. Baldock left hospital yesterday, very (5) ______ to both William and the ambulance service.
Giải thích
very ___ to both William…”
→ Cụm đúng: grateful to
✅ Đáp án: C. grateful
very ___ to both William…”
→ Cụm đúng: grateful to
✅ Đáp án: C. grateful