（）It's meaningful _children_charity work at

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（）It's meaningful _______children_______charity work at a young age.
A.of; to join in B.for;to join in C.of;joining D.for;to join

正确答案为：
D for to join
对于孩子们来说,年轻时参与到慈善工作中去很有意义.
再问：答案是B，我本来也选D
再答：嗯我特地去查了一下 join, join in 的区别

本题是 charity work, 需要用 join in
如果是单独 charity, 就用join

join+团体
join in + 活动

所以是选B

Look at this!What is this?It's the work( make it more meaningful It is meaningful for us students to do some voluntary work同义 it's very______ of you to work at the problem for me.that's It's meaningful that we donate money to help the blind同义句 It's meaningful to raise money for Project Hope but such kin It's meaningful that enough teachers ___(send) to support th to live is more meaningful work It's easy for me （work）it out meaningful it's not fair that you come home after a bad day at work and 英语翻译A:it‘s good to have you back at work again.Two weeks is

（ ）It's meaningful _______children_______charity work at

（）It's meaningful _children_charity work at