你好厉害呀,比我导师还逼得厉害!为了不被说成“just dont want to do my problems”,周末一早就来做功课 . I saw this problem has been solved in WXC, (I went there not on purpose, as you guys talked about posting my problems on WXC), I still post my answer here to let you know at least I have tried. (转自:顶顶华闻 www.TopChineseNews.com ) "Not able to " is not equal to "don't want to" (转自:顶顶华闻 www.TopChineseNews.com ) www.ddhw.com