你会理解这个 if not, not吗

If the weather is fine，we will go. If __________，__________.

A. not，not               B. no，no             C. not，no                D. no，not

此题应选A。这是一个省略句，若补充完整应该是：

If the weather is fine，we will go. If the weather is NOT fine，we will NOT go. 如果天气好，我们就去，若天气不好，我们就不去。

该句的特点是：后句与前句的用词和句式完全相同，只是前句为肯定，后句为否定，为了简洁起见，将后句与前句相同部分省略，只保留否定词 not。类似的例子(只保留否定词not)如：

1. —Can you repair it yourself? 你自己会修吗?

—I am afraid not. 恐怕不行。

(=I am afraid I can’t repair it myself. )

2. —Did you know anything about it? 这事你以前知道吗?

—Not until you told me. 你告诉我才知道。

(=I didn’t know anything about it until youtold me. )

3. —Will it rain today? 今天会下雨吗?

—I hope not. 希望不会。

(=I hope it will not rain today. )