I asked them what they _____ about game shows yesterday.填think 还是thought?为什么?

I asked them what they __thought___ about game shows yesterday.
因为后面有yesterday表示昨天,过去时这个和从句有关系吗？有的啊从句的时态和前面的主句的时态要保持句子的时态一致( ⊙ o ⊙ )啊！难道你忘记了吗例如：I asked who he was我问他是谁，不也是一样(⊙_⊙)？