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【单选题】
（第六章）下列对完全二和之间关系描述正确的是（）。A.
肯定是完全二
B.
完全二肯定是
C.
一颗深度为 7 完全二的结点总数固定
D.
一颗深度为 7 满二的结点总数不固定
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【单选题】What _____ do next? [ ]
A.
you think should we
B.
you think we should
C.
do you think we should
D.
do you think should we
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【简答题】We thank you for this order,and hope we may have the pleasure of supplying you again inthenearfuture.
【单选题】Good heavens! There you are! We _____ anxious about you, we _____ you back much earlier all through the night. [ ]
A.
are; expect
B.
were; had expected
C.
will be; are expecting
D.
have been; were expecting
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