---I’ve told her many times, and she still forgot about it!
---I understand. It’s true that she___ be very forgetful sometimes.
A．canB．shouldC．ought toD．must
A
考查情態(tài)動詞。can 可能，表示理論上的可能性；should，ought to應該；must
必須，一定。It’s true that she___ be very forgetful sometimes表示她有時可能真的比較健忘。表示理論上的可能性。所以選A。
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