To answer this question correctly, we need to understand the meaning of the sentence and the options given.
The sentence states that if you want to get good marks, you need to work hard. So, we are looking for an option that conveys the idea of necessity or obligation.
Let's analyze each option:
Option A:
needn’t
- This option means that there is no need to work hard.
- It contradicts the idea expressed in the sentence.
- Therefore, option A is incorrect.
Option B:
daren’t
- This option means that you are not allowed to work hard.
- It does not convey the idea of necessity or obligation.
- Therefore, option B is incorrect.
Option C:
ought to
- This option means that it is necessary or advisable to work hard.
- It aligns with the idea expressed in the sentence.
- Therefore, option C is correct.
Option D:
none
- This option implies that there is no necessity or obligation to work hard.
- It contradicts the idea expressed in the sentence.
- Therefore, option D is incorrect.
Conclusion:The correct answer is option C:
ought to
.