这两份送出去有一个月了。开始时教授度假或者过节，回来后和我说准备改也有两个礼
拜了。
这个礼拜实在等不及了，想催一下又不知道怎么措辞。结果google了一把，把以下的
email给发了：
Dear Professor,
I was just touching base to see if you may need any more information
regarding the recommendation letter that you were kind enough to provide for
my green card application.
Thanks for taking the time out of your schedule to do this for me.
Best Wishes
结果一个教授马上发回来，说是早就写好了，可是忘记给我发了。另外一个没说原因，
两天后也发过来了。如果有类似情况的同学可以参考一下。
