高一英语选择,The number of people who are in support of him has risen greatly,_____ over 1,300.The number of people who are in support of him has risen greatly,_____ over 1,300.A.have reached B.to reach C.reaching D.to be reaching我知道选C,但我想知道为什么选C?以及为什么不选其他三项?求详细解答和这句话的翻译,

The number of people （who are in support of him） has risen greatly,_____ over 1,300.
划分下句子成分就明白了
主语The number of people
括号里是修饰主语的可以不看
has risen 谓语
一个句子只可能有一个谓语
说明逗号后面不可能是谓语 所以A B D排除
翻译的谢寂生 已经说了

支持他的人数 越来越多了 都超过了1300。
reaching在此做结果状语，所以只能用ing形式。

这个选reaching,在句中作伴随状语.因为后面部分用逗号隔开但是没有相应的连词连接,因此只能用非谓语动词,如果将A改成and is reaching也是可以的.
B、D,虽然从语法上没有什么问题,但是动词不定时做状语一般表示目的、原因、和结果,一般只有以下几种情况：
1）目的状语
To… only to (仅仅为了),in order to,so as to,so(such)… as to… (如此……以便……)
He ran so fast as to catch the first bus.他飞快地跑以便赶上第一班车.
I come here only to say good-bye to you.我来仅仅是向你告别.
2）作结果状语,表事先没有预料到的,要放在句子后面.
What have I said to make you angry.
He searched the room only to find nothing.
3) 表原因
I'm glad to see you.
因此这个句子最好用C.