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at the point of與on the point of的區別：

eg：I was _______ the point of telephoning him when his letter arrived. 
       A) to B) on C) at D) in

■嚴格說來，at the point of與on the point of是有區別的。　　

1. at the point of 指“在……時”“在臨近……時”。如以下實例均摘自英語詞典：　　

at the point of death (=about to die at any moment) 在臨死時　　

at the point of greatest success 在最成功的時候　　

at the point of greatest happiness 在最得意的時候　　

2. on the point of 指“正要……之際”“就要…之時”。如以下實例均摘自英語詞典：　　

She looked on the point of tears. 她看起來就要哭了。

I was on the point of going to bed when you rang. 你來電話時我正要睡覺。　　

He bit his tongue as he found himself on the point of saying ‘follow that car’.  他想說“跟上那輛車”，話到嘴邊又咽了回去。　　

I was on the point of posting the letter when I saw it didn’t have a stamp on it.  我正準備寄信，突然發現上面沒貼郵票。　　

■但事實上，在現代英語中兩者有時可以不加區別地混用。如：　　

The climber was at / on the point of death when they found him. 當他們發現那個登山者的時候，他已奄奄一息。——摘自《牛津高階英漢雙解詞》第6版　　

I was just on the point of going out the door.  我正準備要出門。——摘自《美國英語習語和短語動詞詞典》　　

We were almost at the point of buying a new car. 我們正準備要買輛新車。——摘自《美國英語習語和短語動詞詞典》