问题补充：
Why do we have to Joan’s selfish behavior? She should learn to care for others.
A. keep up with
B. catch up with
C. put up with
D. come up with
答案：
A. keep up with
B. catch up with
(答案→)C. put up with
D. come up with
解析：短语辨析。A. 赶得上 B. 赶上；追上 C.忍受 D.提出；想出。句意：为什么我们不得不忍受约翰自私的行为？他应该学习关心别人。选C。
