Câu hỏi:
17/06/2026 328My elder sisters, both of them were doctors, said they were too busy to pick me up.
A. elder
B. both of them
C. too busy
D. to pick
Trả lời:
Giải bởi Vietjack
Đáp án B: thành “both of whom”
Vị trí của B ta cần trạng từ quan hệ (thay thế tân ngữ) để đặt trong mệnh đề quan hệ.
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