问题

All but one _____ take part in the conference __ tomorrow
A:is going to that is to take place
B:are going to that is about to take place
C:are going to that is to be taken place
D:are going to; which is to be held
B:are going to that is about to take place
C:are going to that is to be taken place
D:are going to; which is to be held
正确答案是: