A.in which
B.for which
C.with which
D.of whom
A.after which
B.with which
C.for which
D.at which
Their success was due to () they had been working hard.
A.the fact of which
B.the fact
C.the fact which
D.the fact that
A.in which
B.in what
C.of what
D.of which
A.valvulotomy
B.angiorrhexis
C.ventriculogram
D.valvulitis