问题
选择题
_ I was_______ the point of telephoning him when his letter arrived.
A．in
B．to
C．at
D．on
答案
答案：D
考查介词。on the point of doing sth.是固定搭配，另外注意这个句子中并列连词when连接的固定句型：on the point of doing...when...,意思是“正要干……这时……”，这样的句型还有 be about to do...when...,was doing...when...。