catch somebody's eye中,eye要不要加s 课文中没有加,但课后短语加了,怎办?

个人意见,两者均可.所以,课本上也是不至可否的.
catch somebody's eye在中学课本中可能说是习惯用语.
但catch somebody's eyes也经常有人说.
下面是网络上的一些例句,对照一下.
She uses many methods to catch his eyes or get him to notice her.
She uses many methods to catch his eye,or get him to notice her.
这两句是一样的意思吧.
Putting effort into your looks once in a while can catch his eyes.
Do you catch his eye every time you glance at him?
下面是Harry Potter中的一个句子.
She looked over at Draco and tried to catch his eyes but he ignored her,his eyes on Laylana.
再问： 若考试，该写哪个呢？ 或许都可以？
再答： 既然课本中两个都有，考试就不会出现了。 如果真的两个都有，那你就用 catch somebody's eye 因为在我们的习惯中是这个用多。 还有一点，大的考试中一般不会考有争议的题目的。因为大考的试题得经得起推敲。 高考中也出现过错误，但近几年几乎没有了。