. Mary was only too ready to help others seldom refusing them when they turned to her.

问题补充：

. Mary was only too ready to help others, seldom, , refusing them when they turned to her.

A. if never

B. if not

C. if any

D. if ever

答案：

A. if never

B. if not

C. if any

(答案→)D. if ever

解析：短语辨析。 A. 如果从来没有 B. 不然的话 C. 即便要，若有的话 D. 如果有的话。句意：玛丽非常乐于助人，如果有人向她求助，她很少拒绝他们。故选D。