问题描述：
.During the past two decades,research has ________ our knowledge of daydreaming.A.expanded B.eme
During the past two decades,research has ________ our knowledge of daydreaming.
A.expanded
B.emerged
C.descended
D.conquered
During the past two decades,research has ________ our knowledge of daydreaming.
A.expanded
B.emerged
C.descended
D.conquered
问题解答：
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