The first thing ________ has to be done is to think of a way to deal with it.
The first thing ________ has to be done is to think of a way to deal with it.
A.which
B.who
C.that
D./
答案及解析： C
The first thing ________ has to be done is to think of a way to deal with it.
A.which
B.who
C.that
D./
答案及解析： C