Directions : In these questions , a part of the sentence is given in bold . Below are given alternatives to the bold part at (A) , (B) and (C) which may improve the sentence . Choose the correct alternative . In case no improvement is needed you answer is (D ) .

Q:

He should not had done it. 

• 1
  should had not
• 2
  should not have
• 3
  should have not
• 4
  No improvement