问题补充：
-Hi,Ann! I won the first prize in the English Speech Contest.
-Congratulations!And I guess your parents mustyou.
A. be mad at
B. be proud of
C. be angry with
D. be impolite to
答案：
A. be mad at
(答案→)B. be proud of
C. be angry with
D. be impolite to
解析：考查形容词短语的辨析。根据句意，获奖了，可推测父母为之骄傲。be proud of“为……而自豪”。
