—I’m very worried about tomorrow’s math test. I’m afraid I can’t pass this time. —! I’m su

问题补充：

—I’m very worried about tomorrow’s math test. I’m afraid I can’t pass this time. —! I’m sure you’ll make it.

A. No problem

B. That’s right

C. Cheer up

D. Don’t mention it

答案：

A. No problem

B. That’s right

(答案→)C. Cheer up

D. Don’t mention it

解析：No problem没问题；That’s right这是正确的；Cheer up振作起来；Don’t mention it不要提了。句意：我非常担心明天的数学考试。我担心这次我不能通过。根据下文，我相信你没问题。可知选C最符合语境。