问题
选择题
He is only too ready to help others，seldom，________refusing them when they turn
to him.
A．if never
B．if ever
C．if not
D．if no
答案
答案：B
B [if ever 为省略用语，意为“如果曾经有过的话”。而seldom，if ever 可形成副词短语，意为“即使有也很少，难得，不常”。]