WHILE ________ TO HELP TIM WITH HIS MATH, I GOT IMPATIENT BECAUSE...

54. - DE THI THU DAI HOC MON TIENG ANH VA DAP AN
DE THI THU DAI HOC MON TIENG ANH VA DAP AN

54.

While ________ to help Tim with his math, I got impatient because he wouldn’t

pay attention to what I was saying.

a. I am trying

b. having tried

c. I try

d. trying