suddenly occurred to me I had to attend an important meeting in Shanghai the next day.
A. It; which
B. What; that
C. What; which
D. It; that
网友回答
A. It; which
B. What; that
C. What; which
(答案→)D. It; that
解析：句意：我突然想起我第二天得参加一个在上海举行的一个重要的会议。我突然想起是固定句式： It suddenly occurred to me that ....故选D。
考点: 考查固定句型的用法。