My 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
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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