He at the meeting but his heart attack prevented him.A. will speakB. is going to speakC.

问题补充：

He at the meeting, but his heart attack prevented him.

A. will speak

B. is going to speak

C. had to speak

D. was going to speak

答案：

A. will speak

B. is going to speak

C. had to speak

(答案→)D. was going to speak

解析：由题意“他本来打算在会上发言，但……”可知应选D项。