During the past two decades,research has______our knowledge of daydreaming.

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问题 During the past two decades,research has______our knowledge of daydreaming.

选项 A、expanded
B、emerged
C、descended
D、conquered

答案A

解析 在最近的20年间,研究已经拓展了对白日梦的知识。expand:拓宽,拓宽;emerge:显现,浮现;descend:下降;conquer:占领。
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