问题: 单选
请高人分析，多谢
3.It is not until about the time a child enters school ( ) outside forces contribute to feelings about the self.
A. when B. which C. who D. that
5.It is impossible to solve ( ) in such a short time.
A. so difficult a problem B. so difficult problem
C. a so difficult problem D. so a difficult problem
解答:
3D
这是一个not until结构的强调句型。
基本形态：It is + not until + 表示时间的名词（词组）或时间状语从句 + that + 句子剩余部分
5A
so + adj.（形容词）+ a/an + c.n.<singular form>(可数名词单数)
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