It was that they went for a walk in the park.A. such a fine weatherB. so fine a weatherC.

问题补充：

It was that they went for a walk in the park.

A. such a fine weather

B. so fine a weather

C. such fine weather

D. so fine weather

答案：

A. such a fine weather

B. so fine a weather

(答案→)C. such fine weather

D. so fine weather

解析：考查特殊句式。So+adj+a/an+名词=such+a/an+adj+名词；但是本题的weather是一个不可数名词，不能用a/an修饰。句意：天气是如此之好，以至于他们去公园散步了。故C正确。