Before the problem can be solved,it must
问题:
Before the problem can be solved,it must be obvious ________ the problem itself is.(2011·湖南,31)
A.what
B.that
C.which
D.why
Before the problem can be solved,it must be obvious ________ the problem itself is.(2011·湖南,31)
A.what
B.that
C.which
D.why