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.
for their employees' paychecks, assigned by them
for the paychecks of their employees who have been assigned
for the paychecks of their employees, having been assigned
in place of their employees' paychecks, for those of them assigned
in place of the paychecks of their employees to have been assigned by them
BC的区别终于搞懂了,一个限定一个非限,所以选B.
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