书名：挑战新多益阅读满分2
页数：96
题目： (105)
The owner of Print Depot personally wrote a letter ____ for the typo
that appeared on the law firms's brochure.
(A) has apologized
(B) apologizes
(C) apologizing
(D) will apologize
疑问：答案给C，虽然选项没有，但我会想选 to apologize 耶?
书名：挑战新多益阅读满分2
页数：96
题目： (106)
Most employees adapt quickly to Gordon Industries' unique working
conditions, but those ____ comfortable with unconventional leadersh-
ip styles have difficulty.
(A) less
(B) nothing
(C) little
(D) even
疑问：答案给A，为何C不对?
以上2题，恳请各位大大解答，万分感谢。

因为关系子句本身没了which就少了主词，所以has apologized 不能单独存在，同理,不能选(D)这种省略关代，关系子句动词改成分词Ving(表示主动)，(being) p.p.(表示被动)，只会出现在关代为主格的用法