搜搜考试网They have been （ ）自愿 their time for a long time
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They have been （ ）自愿 their time for a long time
volunteered
词组：volunteer one's time to do sth 志愿某人的时间做某事
再问： 是被动吗？
再答： 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
词组：volunteer one's time to do sth 志愿某人的时间做某事
再问： 是被动吗？
再答： 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
They have been （ ）自愿 their time for a long time
they have been friends（ for a long time） 括号部分提问
l have been looking for someone for a long time
英语翻译they had been going out for a long time
Have you been here for a long time?
I have been chasing for a long time
I have been loving you for a long time
i have been here for a long time
We have been waiting a long time.不用for a long time
英语翻译（14）A long time ago men hunted for their food.Often they
I have been away for a long time等于I____a long time_____.
We have been good friends a long time.这里的a long time之前不用加for