He is only too ready to help others, sel
问题:
He is only too ready to help others, seldom, _____, refusing them when they turn to him.
A.if not
B. if ever
C.if any
D.if so
He is only too ready to help others, seldom, _____, refusing them when they turn to him.
A.if not
B. if ever
C.if any
D.if so