高一英语选择,The number of people who are in support of him has ri

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.

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 ...

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。