It is important to know about the cultural differences that cause problems. A．mu

 It is important to know about thecultural differences that________cause problems.

试题答案

【答案】

D

【解析】这题考查情态动词的用法：may表示“不确定性”可能，句意是：了解一些会产生问题的文化差异很重要。选D。