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题目内容
（阿坝师范学院大学英语）
I felt somewhat disappointed and was about to leave, ___ something occurred attracted my attention. [
A、 ] unless [
B、 ] while
C、 ] when [
D、 ] until [
A、 ] unless [
B、 ] while
C、 ] when [
D、 ] until [
参考答案