IF I HEARD FROM JACK, I ... LET YOU KNOW.A. WILLB. WOULDC. SHALLD....

12. - 3500 CAU TRAC NGHIEM ON TAP AV THCS
3500 CAU TRAC NGHIEM ON TAP AV THCS

12. If I heard from Jack, I ... let you know.

a. will

b. would

c. shall

d. had

 b