Mark the letter A, B, C, or D to indicate the correct response to each of the following exchanges

A. How can you explain "rush”?

B. How do you spell “rush”?

C. What does "rush” mean?

D. What is the equivalent of “rush”?

A. What are the meanings of “for” and “since”?

B. What's the difference between “for” and “since”?

C. How to see the difference between “for” and “since”?

D. How similar are “for” and “since”?

A. Yes, so what? I want to keep learning until I can hold a conversation like a native speaker.

B. It's none of your business! I want to keep learning until I can hold a conversation like a native speaker.

C. I suppose it is, but I want to keep learning until I can hold a conversation like a native speaker.

D. Well, look at yourself first. I want to keep learning until I can hold a conversation like a native speaker.