It's quite bright ________ the little boy ________ that maths problem.A.ofA.of; to work outB.of; working outC.for; to work outD.for; working outA.of X

It's quite bright ________ the little boy ________ that maths problem.A.ofA.of; to work outB.of; working outC.for; to work outD.for; working outA.of X
It's quite bright ________ the little boy ________ that maths problem.A.of
A.of; to work out
B.of; working out
C.for; to work out
D.for; working out
A.of X

It's quite bright ________ the little boy ________ that maths problem.A.ofA.of; to work outB.of; working outC.for; to work outD.for; working outA.of X
A
It's quite bright ___of_____ the little boy ___to work out_____ that maths problem
1）for sb.常用于表示事物的特征特点,表示客观形式的形容词,如easy,hard,difficult,interesting,impossible等：
It's very hard for him to study two languages.对他来说学两门外语是很难的.
2）of sb的句型一般用表示人物的性格,品德,表示主观感情或态度的形容词,如good,kind,nice,clever,foolish,right.
It's very nice of you to help me.你来帮助我,你真是太好了.
for 与of 的辨别方法：
用介词后面的代词作主语,用介词前边的形容词作表语,造个句子.如果道理上通顺用of,不通则用for.如：
You are nice.(通顺,所以应用of).
He is hard.(人是困难的,不通,因此应用for.)

a bright 这里是表明主语的属性,特征,用of

it is +形容词+for sb to do(形容词修饰to do的事情）
it is +形容词+of sb to do(形容词修饰人，表示人的品质、性格）
这里quite bright 是修饰人的（聪明），用of
选A

C, for是介词，对于。句型：It is adj. for sb to do sth

C.for; to work out