Câu hỏi:
17/06/2026 249Gold _______in California in the 19th century.
A. was discovered
B. has been discovered
C. was discover
D. they discovered
Trả lời:
Giải bởi Vietjack
Đáp án A
Dấu hiệu nhận biết thì QKĐ: ‘in the 19th century’ (vào thế kỉ thứ 19)
→ Động từ cần điền chia dạng bị động thì QKĐ là ‘was/were PII’.
Dịch nghĩa: Vàng được phát hiện ở California vào thế kỷ 19.
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