We know through painful experience that freedom is never given by the oppressor; it must be_____We know through painful experience that freedom is never given by the oppressor; it must be ____________by the oppressedA demanded B required C commanded

We know through painful experience that freedom is never given by the oppressor; it must be_____We know through painful experience that freedom is never given by the oppressor; it must be ____________by the oppressedA demanded B required C commanded
We know through painful experience that freedom is never given by the oppressor; it must be_____
We know through painful experience that freedom is never given by the oppressor; it must be ____________by the oppressed
A demanded B required C commanded D requested
为什么选A?并比较分析一下这四个词.

We know through painful experience that freedom is never given by the oppressor; it must be_____We know through painful experience that freedom is never given by the oppressor; it must be ____________by the oppressedA demanded B required C commanded
demand :to ask for sth. very firmly；to say very firmly that sb. should have or do sth.指强烈要求,坚决要
require:[often passive](rather formal)to make sb. do or have sth,especially because it is necessary according to a law or set of rules or standard指要求做（某事）,达到（某水平）,尤指根据法律或规定
command(给人或动物的)命令
request（正式或礼貌的）要求,请求
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