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
Giải bởi qa.haylamdo.com
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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