there are twenty boys in our class,_____ myself.A.include B.

选B
C显然意思就不对.主要是include 和including 的区别
include前面要有主语的,作为动词．如：
The price includes postage charges.
价格包括邮费在内.
I include eggs on the list of things to buy.
我在要买的货单上包括了鸡蛋.
The university includes ten colleges.
该大学有10个学院.
including 介词,一般用在逗号后面,这个是标志哦,或者是冒号的前面,总之,是用标点隔开用的,但是有的时候它也是可以放在句子中的．
Seven, including a goalkeeper.
7名,包括一位守门员.
trademarks (including service marks);
商标(包括服务商标)；
an arthropod family including: chalcidflies.
包括在节肢动物一族；小蜂科之蜂.