(They have hold), it is in the fitness of things that the legislature should be taken into confidence on Brexit.

Options

A. They have holding
B. They have held
C. They has held
D. No Improvement

Answer

B

Explanation

Structure of sentence in Present Perfect : Subject+ has/have + `V_3`
Hence, They have held should be used here.
Hold : to have a belief or an opinion about something.