为什么有的明明有位置,却老选不了呢?

[挥着翅膀的眼泪]

我打算报一个MATH1009,有两个老师:Elena Devdariani & Sam Melkonian, 其中有一项两个老师的Schedule都是一样的,但是我只能选中SAM 的,而每次选ELENA的总会出错,如下:
Status:
Reserve Closed XXXXXXXXXXXXXXXX
Link Error:B XXXXXXXXXXXXXXXX
required

难道人满,可是没有"C"啊? 我再继续选WINTER的一些课也有此等问题,不明白!
请前辈们指教!
还有就是,这两个老师哪个好呢?

 

[punkren]

MATH1009不必介意老师，对中国人来说太简单了

 

[1784]

Sam is a very bright man, very smart. And he is easy going too. I had him for 3705. He had the entire book in his head (he wrote the book, but still)

 

[darkforce]

课被RESERVE了,所以选不了.