问题
选择题
As a good friend of his, I offered Tom my congratulations ______ his passing the college entrance exams.
A．at
B．on
C．for
D．of
答案
答案：B
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As a good friend of his, I offered Tom my congratulations ______ his passing the college entrance exams.
A．at
B．on
C．for
D．of
答案：B