the foreign guests,__ were goverment officials,were warmly welcomed at the airport

题目

the foreign guests,__ were goverment officials,were warmly welcomed at the airport
a.most of them
b.most of that
c.most of whom
d.most of those
为什么选c。

答案

选C
the foreign guests为先行词,whom是the foreign guests的宾语,指代the foreign guests
主句为the foreign guests were warmly welcomed at the airport.
而从句为 most of the foreign guests were goverment officials.
从句只是补充说明的