Question

Fill in the blank with a suitable preposition:
__________ the first sign of illness, see your doctor.

• A. With
• B. On
• C. In
• D. At

Answer 1

The correct option is D At

Option D- At is used to indicate a point of time or place, state, direction. age or occupation, degree. The given sentence indicates a given point in time. Thus option D is the correct answer.

Option A- With is used to indicate means, possession, contents, relationship, for and against. It does not fit the meaning of the sentence. Hence it is incorrect.

Option B- On is used to indicate place,specific date, direction, by means of or about. It does not fit correctly in the given sentence. Hence it is incorrect.

Option C- In is used to indicate inclusion within space, a place, or limits,inclusion within or occurrence during a period or limit of time. It does not fit correctly in the given sentence. Hence it is incorrect.