THESE ARE OUR PENS, AND THOSE ARE ...A. THEIRB. THEY ONESB. THEY O...

23. - 3500 CAU TRAC NGHIEM ON TAP AV THCS 23. - 3500 CAU TRAC NGHIEM ON TAP AV THCS
3500 CAU TRAC NGHIEM ON TAP AV THCS

23. These are our pens, and those are ...

a. their

b. they ones

c. theirs

d. their pens

 c