Correct Answer:
A. Work in great hurry
The idiom "Work against the clock" means to work very quickly because there is not much time. It implies a sense of urgency and pressure to complete a task before a deadline.
- A: Work in great hurry perfectly captures the essence of the idiom, emphasizing speed due to time constraints.
- B: Work with concentration is incorrect; while concentration might be involved, the core meaning is about speed and urgency.
- C: Work against all problems is incorrect; this idiom focuses on time pressure, not general obstacles.
- D: Work in the night is incorrect; working at night might be part of working quickly, but it's not the primary meaning of the idiom itself.
Idioms often convey a specific situation or feeling that cannot be understood from the individual words.