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题目内容
(许昌大学大学英语3(专升本))
(单选题) I didn’t realize he was a famous film star ______ he took off his dark glasses.(本题1.0分)
A、 when
B、 until
C、 unless
D、 once
A、 when
B、 until
C、 unless
D、 once
参考答案