单选题 Speaker A: I thought you were going to the conference in USA last Saturday.
Speaker B: ______, but I haven"t been feeling well, so I stayed home.

【正确答案】 C

【答案解析】[解析] A说“我以为上周六你去美国参加会议去了呢。”请注意were/was going to的内在意思是某一个动作并没有发生。C项“我本来计划要去的，但是那天不舒服，所以就留在家里了。”刚好与后面的部分构成转折关系，符合题意。其他选项均不正确。