keep someone on a string

• 使某人悬虑；使某人焦急不安；使某人没有着落

keep someone on a string的用法和样例：

例句

1. They have been keeping me on a string for two weeks and still haven't said whether or not they accept my offer.
   他们一直使我悬虑了两个星期，结果仍然没有说出他们是否接受我的提议。