UNIT 49I. PRONUNCIATION

49. - 3500 CAU TRAC NGHIEM ON TAP AV THCS 49. - 3500 CAU TRAC NGHIEM ON TAP AV THCS
3500 CAU TRAC NGHIEM ON TAP AV THCS

49. You ... tidy up your house before your parents come back.

a. would have

b. should

c. ought

d. should have

 b