单选题_____AimportantBmysteriousCspecialDclear
单选题
_____
A
important
B
mysterious
C
special
D
clear
参考解析
解析：
while在此作“尽管”讲，表达一种让步，前后语句有转折的意思，意为“然而”。由前一句“尚不清楚”可知，此空白处应选“clear（清楚的）”，故选D。
while在此作“尽管”讲，表达一种让步，前后语句有转折的意思，意为“然而”。由前一句“尚不清楚”可知，此空白处应选“clear（清楚的）”，故选D。
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