【题目】—I met your uncle on my way to school this morning.
—Ah? You _____ be joking. He flew to Germany yesterday evening!
A. might B. should C. could D. must
在线课程【答案】D
【解析】
试题分析：might 或许，可能；should 应该，应当；could 可能；must 想必，一定。根据“He flew to Germany yesterday evening!”可知他昨天晚上乘飞机去德国了，你不可能今天早晨看见他，你一定是在开玩笑，must 符合语境，故选D。