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题目内容
（大连工业大学-大学英语2）
(单选题) It was not until he arrived at the station ___________ he realized he had forgotten his ticket(本题3.0分)
A、 before
B、 when
C、 that
D、 after
A、 before
B、 when
C、 that
D、 after
参考答案
