问题补充：
---- “I haven heard from Henry for a long time.”
------ “What do you suppose to him?”
A. was happening
B. to happen
C. has happened
D. had happened
答案：
A. was happening
B. to happen
C. has happened
D. had happened
解析：
此题容易误选B，认为动词suppose后接动词用不定式。正确答案应是C，其中的do you suppose是插入成分。
