问题
It was _____ she took off her dark glasses _____ she was a famous film star. [ ]
A: when, that didn't realize
B: not until, that I realized
C: not when, when I realized
D: until, that I didn't realize
B: not until, that I realized
C: not when, when I realized
D: until, that I didn't realize
正确答案是：
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