Tenses and Verbs Practice

Find the part of the sentence that contains an error:
(A) The selection committee / (B) comprises of / (C) seven senior members. / (D) No error

Choose the option that best replaces the part marked between :
"My uncle has returned from Delhi yesterday."

Select the most appropriate replacement for the part marked between :
"It is high time the government takes strict action against polluting factories."

Choose the best replacement for the part marked between :
"She is working in this office since 2015."

Choose the option that best replaces the part marked between :
"He did not know to swim, so he stayed on the bank."