—Oh, my God！Our teacher is so mean!
—Calm down, my friend.Even though she is tough sometimes, she be nice if you really work hard.
A. must
B. should
C. can
D. shall
网友回答
A. must
B. should
(答案→)C. can
D. shall
解析：
考查情态动词。答语语意：冷静下来，朋友！尽管她有时是严厉的，但是如果你真正努力学习的话，她会非常和蔼的。can表示一种可能性。