The problem was that it is valuable everyday use. A. too; toB. too; forC. too; ofD. so; t

问题补充：

The problem was that it is valuable everyday use.

A. too; to

B. too; for

C. too; of

D. so; that

答案：

A. too; to

(答案→)B. too; for

C. too; of

D. so; that

解析：考查固定句型。so...that...“如此......以至于......”，that后跟句子，这里不是一个完整的句子，排除D项；too... to...是“太......而不能......”的意思，to后加动词原形；It is +形容词 for sth./for sb. to do sth.是固定句型，意为“对于某物或某人来说，做某事......”。故选B。