题目内容
It was thirty years ________ he was invested as an outstanding alumnus to celebrate the 128th anniversary of the university.
[ ]
A.
as
B.
while
C.
before
D.
until
答案:C
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题目内容
It was thirty years ________ he was invested as an outstanding alumnus to celebrate the 128th anniversary of the university.
as
while
before
until