词汇选项：
For them moderation is ______ vital importance.
A.against
B.below
C.on
D.of
【正确答案】D
【答案解析】本句中is后面应该是表语部分，四个选项中只有of合适，of importance=important,of vital importance=very,very important.
词汇选项：
For them moderation is ______ vital importance.
A.against
B.below
C.on
D.of
【正确答案】D
【答案解析】本句中is后面应该是表语部分，四个选项中只有of合适，of importance=important,of vital importance=very,very important.
