To assure (A) the safety of those workers who (B) must handle radioactive material, the employer should not leave (C) them enter (D) contaminated areas without protective clothing.
Đáp án C => let
“leave” và “let” đều mang nghĩa là cho phép ai đó làm gì nhưng hai từ được sử dụng với hai cấu trúc khác nhau.
Let sb do sth = leave sb to do sth
Dịch: Để đảm bảo an toàn cho những người công nhân này – người mà phải giải quyết chất phóng xạ, thì người chủ không nên để họ đi vào vùng có chất độc mà không có trang phục bảo hộ.
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