1个简单英语单选题

题目

1个简单英语单选题
The event included a number of lectures and workshops that were __ to the public.
A open
B opens
C opened
D opening
答案怎么选A.难道不是C?

答案

选A,因为这里的open是当形容词来用的,意思是“公开的,开放的”.不是做动词用,所以不选C.
请及时采纳,多谢!