两个简单的小问题，大家进来看看～谢谢！

canviss

1、不是问答案，是问一个用法哈

In theory, international civil servants at the United Nations are prohibited from continuing to draw salaries from their own governments；in practice, however some governments merely substitute living allowances for their employees' paychecks, assigned by them to the United Nations.

    A
    for their employees' paychecks, assigned by them  
    B
    for the paychecks of their employees who have been assigned  
    C
    for the paychecks of their employees, having been assigned  
    D
    in place of their employees' paychecks, for those of them assigned  
    E
    in place of the paychecks of their employees to have been assigned by them  
这道题的C选项，for the paychecks of their employees, having been assigned 后面的having been assigned是不是看成伴随状语噢，还是说是后置定语（但是在这里，如果要是后置定语，是不是应该去掉那个逗号呢？）求大神解释～

一言以蔽之，就是想问，现在分词做后置定语的话，可以不可以前面带个逗号，可以的话以后遇到后置定语和伴随状语就要小心区分，不可以的话就可以分分钟看出来逗号后面带的应该是伴随状语。。。

2、do sth like sb和do sth as sb do 都是对的是吗？就是都是像某人一样做啥事儿吗？
Proponents of artificial intelligence say they will be able to make computers that can understand English and other human languages,recognize objects, and reason （as an expert does-computers that will be used to diagnose equipment breakdowns, deciding whether to authorize a loan or other purposes such as these. ）
括号里的正确答案是like an expert-computers that will be used for such purposes as diagnosing equipment breakdowns or deciding whether to authorize a loan
但是reason是动词噢，可以接like an expert?

都听说CD是个温暖的大家庭，希望各位兄弟姐妹给我解答解答，谢谢！