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Mobile phones: a benefit or social nuisance?

Câu hỏi: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 26 to 30.
Mobile phones: a benefit or social nuisance?
Few people under 30 will be able to imagine a time before the existence of mobile phones. Neither will they be (26)_________of the harmful effect that many people predicted text language would have on young people's language skills.
Interestingly, linguists nowadays believe that expressing oneself clearly in texts is evidence of a good background in grammar and sentence structure. Mobile phones are credited with encouraging people to communicate more. They can also provide reassurance to people (27)_________are alone in dangerous situations. Some people use mobile phones as a kind of barrier to unwelcome social contact; texting can signal your unavailability to (28)_________people in the same way that wearing sunglasses and headphones does.
Some issues with mobile phones are still controversial. Talking loudly on the phone while on public transport is thought to be rude and (29)_________by many people in the UK. (30)_________, a significant minority of people still do it, despite the sighing and other obvious signs of disapproval from their fellow passengers.
(Adapted from "AdvancedExpert'' by Jan Bell and Roger Gower)
The word or phrase which best fits the gap (27) is...
A. which
B. when
C. where
D. who
Kiến thức: Đại từ quan hệ
Trong mệnh đề quan hệ:
which + V: cái mà … => bổ sung thông tin cho từ chỉ vật trước nó
when + S + V : khi mà …
where + S + V: nơi mà …
who + V : người mà … => bổ sung thông tin cho từ chỉ người trước nó
"people": con người => chỉ người nên cần dùng "who"
They can also provide reassurance to people (27) who are alone in dangerous situations.
Tạm dịch: Chúng cũng có thể trấn an cho những người ở một mình trong những tình huống nguy hiểm.
Đáp án D.