问题
Do you know ________— All of them ________ the museum.
A:where are the students; have gone to
B:where are the students; have been to
C:where the students are; have gone to
D:where the students are; have been to;
B:where are the students; have been to
C:where the students are; have gone to
D:where the students are; have been to;
正确答案是：
