选择：It’s of great ( ).A valuable B value C valueless D unvaluable 为什么?

选择：It’s of great ( ).A valuable B value C valueless D unvaluable 为什么?

B
be + of + 抽象名词 = 形容词
be of great value = valuable
be of great use = useful
be of great help = helpful

B
be of great value=be very valuable 很有价值

b 固定词组