what do you think of his suggestion we all attend the meeting?A,which b,whether c,that d,what 我知道是定语从句 但不缺少成分为什么选that?

问题描述:

what do you think of his suggestion we all attend the meeting?
A,which b,whether c,that d,what 我知道是定语从句 但不缺少成分为什么选that?

完整的就不是定语从句了,是同位语从句,补充说明suggestion的.