A. It was not until everyone had gone home that Olivia left the office.
B. It was until everyone had gone home that Olivia didn’t leave the office.
C. Not until everyone had gone home that Olivia left the office.
D. It was not until everyone had gone home did Olivia leave the office.
Kiến thức: Cấu trúc “...not...until...”
Giải thích:
S1 + did + not + V + until + S2 + had Ved/ V3
= It was not until S2 + had Ved/ V3 + that + S + Ved/ V2: Mãi cho đến khi... thì...
Tạm dịch: Olivia không rời văn phòng cho đến khi mọi người về nhà.
A. Mãi cho đến khi mọi người về nhà thì Olivia rời khỏi văn phòng. => đúng
B. Mãi cho đến khi mọi người về nhà thì Olivia vẫn không rời khỏi văn phòng. => sai nghĩa
C. sai ngữ pháp: không dùng “that”
D. sai ngữ pháp: did Olivia leave => Olivia left
Chọn A
She raised her hand high so that she could attract her teacher's attention.
She didn’t understand the benefits of volunteering until she joined this club.