English » Spotting Errors

The following sentence has been split into four segments. Identify the segment that contains a grammatical error.

She performed / the task / at the best / of her ability.

A

the task

B

at the best

C

of her ability

D

She performed

Solution

the erroneous part is option B 

at the best of her ability should be replaced with to the best of her ability.

​​​​​​​this is the correct fixed usage.