Alex: How are you, Bob?
Bob: _______________
A. I’m very fine. Thank you.
B. Terrible! I’ve got Covid-19!
C. Can’t complain.
D. No worries, mate.
答案选 Can't complain。意思是是“还行”“没什么可抱怨的”。
B和D不符合交际习惯,至于A,不应该有very。