He is ready to help others ,seldom,    refusing them when they turn to him.

   A. if never                 B．if ever                C. if not                    D．if any

He is ready to help others ,seldom, ______refusing them when they turn to him.

   A. if never       B．if ever     C. if not  D．if any

He is ready to help others, seldom, ______ refusing them when they turn to him.

A．if never               B．if ever         C．if not                D．if any

He is ready to help others, seldom, ______ refusing them when they turn to him.

1. A.
   if never
2. B.
   if ever
3. C.
   if not
4. D.
   if any