问题

Not until he had left his friend _______ how importantfriendship was for him.
A:did herealize
B:he realized
C:had herealized
D:he hadrealized
B:he realized
C:had herealized
D:he hadrealized
正确答案是:
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d have gone to my cousin’s birthday party lastnight, but I ______ available.
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