---I’ve told her many times, and she still forgot about it!
---I understand. It’s true that she be very forgetful sometimes.
A. can
B. should
C. ought to
D. must
网友回答
(答案→)A. can
B. should
C. ought to
D. must
解析：考查情态动词。can 可能，表示理论上的可能性；should，ought to应该；must
必须，一定。It’s true that she be very forgetful sometimes表示她有时可能真的比较健忘。表示理论上的可能性。所以选A。