never thought与didn’t think有什么区别

Come in, Peter, I want to show you something.
Oh, how nice of you! I ______ you ______ to bring me a gift.
A. never think, are going
B. never thought, were going
C. didnt think, were going
D. hadnt thought, were going
答案为 B，请问为何？谢谢！

never thought 的意思是从来没想到，didnt think 的意思是（过去）没想到。比如：
We didnt think wed be this late. 大家没想到会这么晚。（Longman Dictionary of American English, p.1419）