问题补充:
The letterTommy received from his company yesterday is very important.
A. who
B. where
C. what
D. that
答案:
A. who
B. where
C. what
(答案→)D. that
解析:本题考查先行词the letter的定语从句的引导词,由于先行词是物不可用who(who指人),也不可用关系副词where(where指地点)以及代词what(what不是关系代词),故选D,that作定语从句的宾语,指代the letter.