问题补充:
Though I have no idea the new film is about, I know it is popular with all who have seen it.
A. whether
B. why
C. that
D. what
答案:
A. whether
B. why
C. that
(答案→)D. what
解析:本题考查同位语从句。从句中about是介词后没有宾语,故应选择作宾语的引导词,所以选D。what引导名词性从句在句中可作主语、宾语、定语或表语。