30.
(A) be
(B) being
(C) had
(D) has

被動語態是由be+Vpp所組成，所以在分詞構句中，被動語意的Vpp前面都隱含著being，不論有沒有寫出來。不寫出being時，它只是單純的被動語意；帶有being時，不但是被動，而且有動作持續中的語意。

Brought to the police station, he still believed that he had done nothing wrong.

被押往警局，他仍堅信他沒做錯事。

Being brought to the police station, he thought of his father's advice.

被押往警局途中，他想起了他父親的忠告。

不過：

1) 如果Vpp是瞬間動詞，則前面的being可省略。

(Being) hit by a car, he was badly wounded.

2) 如果Vpp是形容詞語意，則前面的being可省略。

(Being) satisfied with the terms and conditions, he signed the agreement.

資料來源：yahoo知識＋

-----------------------------------------------------------------

所以在此題敘述中，「the age of the person」為主詞，這個東西直到現在仍「被」慶祝，此為分詞構句的「被動」語意 being Vpp，選 being！