Câu 621: a. I was, but I missed the registration deadline. b. Why weren’t you at the marathon last weekend? c. That’s unfortunate. You train...

Câu 621: a. I was, but I missed the registration deadline.

b. Why weren’t you at the marathon last weekend?

c. That’s unfortunate. You trained so hard for it.

d. I know, but I’ll sign up earlier next year.

e. Good idea! You don’t want to waste all that effort.

f. Exactly! I won’t make the same mistake twice.

A. b-a-c-d-e-f
B. b-c-a-e-d-f
C. b-a-c-e-d-f
D. b-d-a-c-f-e