He is () his thirtiesA at B in C for D withAs a matter of fact,his students learn a lot () himA from B by C for D with

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Heis()histhirtiesAatBinCforDwithAsamatteroffact,hisstudentslearnalot()himAfromBbyCforDwithHeis()hist

He is () his thirtiesA at B in C for D withAs a matter of fact,his students learn a lot () himA from B by C for D with
He is () his thirties
A at B in C for D with
As a matter of fact,his students learn a lot () him
A from B by C for D with

He is () his thirtiesA at B in C for D withAs a matter of fact,his students learn a lot () himA from B by C for D with
He is (in) his thirties
in是指在一段时间中,他30多岁,是在30到40间,所以只能用in.如果用at,是指某个确切的点,显然不合；另外,用for和with都不合.
As a matter of fact,his students learn a lot (from) him
从他那里学到,自然是用from.如果是由他教的,那就要用by；同他一起学的,用with；为他而学,用for.

我个人的选择是B

B
他现在三十多岁.
A
learn from sb
向某人学习.

固定用法!

in one's thirties
是固定结构了，表示某人多少岁，同样也可以说
我今年20几了：I am in my twenties.B
learn from sb
向某人学习.

he is on his way he is writing () his notebook. he is sure ( )his success he is in his early he is green at his Who's he He is( )his bedroom. He is taking his book.He can take his book. He is taking his book He can take his book His father is my father.he is What is his ()?Is he a waiter. He is like his father.=He looks like his father.=He and his father ( ) ( ) ( ) he is doing something fun he is meeting his friends He is always in his words He is doing his homework 中文 He is doing his homework .翻译 He is b___doing his homework now. He is buzy _____ his homework. he is()doing his homework速求!