Expression: 'a bit difficult'

[Hugh]

Business English Courses, Elementary Level

ESL/EFL Test #71 "Chit Chat: At the garage", question 4

Mechanic: That's a ......... of a difficult answer to give in a few words.

(a) part
(b) lot
(c) bit
(d) section

Business English Courses, Elementary Level

ESL/EFL Test #71 "Chit Chat: At the garage", answer 4

Mechanic: That's a bit of a difficult answer to give in a few words.

Correct answer: (c) bit

Your answer was: incorrect
Mechanic: That's a part of a difficult answer to give in a few words.
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Why does this sentence use 'bit' ?

Hugh

[Alan]

Hi Hugh,

The sentence doesn't suggest that some of the question or part of the question is difficult. A bit of a suggests that it is quite/a little difficult.

Alan
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