问题补充：
—I’ve got to go now.
—Must you? I you could stay for dinner with us.
A. think
B. thought
C. have thought
D. am thinking
答案：
A. think
(答案→)B. thought
C. have thought
D. am thinking
解析：考查时态：句意是：--我现在得走了。--你偏要走吗？我以为你会带下来和我们一起吃饭呢。因为现在知道了。说明是过去这么认为的。选B。
