Each question in this section has sentence labelled as (a), (b) and (c) . Read each sentence to find out whether there is any error in any of the part . If you find no error , your aswer should be indicated as (d).
`("These are the ideas and ideals")/a` `("which have shaped")/b` `("our economic thought in the past")/c` `("No error")/d`.

Explanation

(b) replace .have. by .had.