有一读者问：有这样一道选择题：
(1)Who can you imagine_________to the hall?
A. inviting B. being invited
C. was invited D. to be invited
答案是C，这是一种什么结构？
上述句（1）在语法中唤作复合疑问句，它由一般疑问句 can you imagine 和 who was invited to the hall 揉合而成。再如：
(2)What do you think is the best film of the year?
(3)How far do you imagine it is from here?
