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英语
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They have been ( )自愿 their time for a long time
人气:314 ℃ 时间:2019-09-09 17:35:47
解答
volunteered
词组:volunteer one's time to do sth 志愿某人的时间做某事是被动吗?啊~~~错了错了~~~应该是 volunteering是现在完成进行时态,抱歉,这次可以放心采纳了后面 for + 时间段,句子应该用完成时,或者完成进行时态【注】现在完成进行时的结构:have/has been doing sth表示从过去开始的动词,一直持续到现在,现在还在做
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