English » Sentence Improvement

Select the most appropriate option that can substitute the underlined segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’.

When Sirisha knock at the door someone peeped through the window.

A

No substitution required

B

knocked at the door

C

knocked door

D

knocked on door

Solution

option B is the right pick here,

knock at the door should be replaced with knocked at the door.

the given sentence is in past indefinite so we should past form of the verb knock that is knocked.