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Itisthatwehadbettergoforawalk.A.sobeautifulanightB.suchbeautifulanight答案选的A,为什么不选B呢,

题目详情
It is _that we had better go for a walk.
A.so beautiful a night B.such beautiful a night
答案选的A,为什么不选B呢,
▼优质解答
答案和解析
因为so+形容词+a/an+名次,而such+a/an+形容词+名词,
所以不能说such beautiful a night,而是such a beautiful night