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【判断题】
设某棵二叉树的前序遍历序列为ABDEC，中序遍历序列为DBEAC，则该二叉树的的后序遍历序列为DEBCA。A.
正确
B.
错误
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【单选题】（辽宁卷） 23 ． Susan decided not to work on the program at home because she didn’t wanther parents to know what she __________.
A.
． has done
B.
． had done
C.
． was doing
D.
． is doing
【单选题】The football player felf extremely _______________ after they won the game.
A.
luck
B.
lucky
C.
luckily
D.
unlucky
【单选题】The football player felt extremely _____________ after they won the game.
A.
luck
B.
lucky
C.
luckily
D.
unlucky
【单选题】Susan decided not to work on the program at home because she didn’t want her mother to know what she _____.
A.
has done
B.
had done
C.
was doing
D.
is doing
【单选题】Susan decided not to write her resignation in the office because she didnt want her colleagues to know what she ______.
A.
has done
B.
had done
C.
was doing
D.
is doing
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