During the past two decades, research has ________ our knowledge of daydreaming.
A
A扩大B浮现、露出C下降D征服
Although Tom is satisfied with his academic achievement，he wonders _______ will happen to his family life .
Peoplewhocan’t_______betweencolorsaresaidtobecolor-blind.
Duringthepasttwodecades,researchhas________ourknowledgeofdaydreaming.