Choose the option that best complete the gap (s): If you are confused_______anything, phone my office.

Choose the option that best complete the gap (s):

If you are confused_______anything, phone my office.

Answer Details

The option that best completes the gap is "about". The sentence is saying that if the person is confused about anything, they should call the speaker's office. Therefore, the preposition "about" is the most appropriate choice to indicate the topic or subject of confusion. Hence, the correct answer is "about".