2. 外语
  3. I felt somewhat disappointed and was about to leave,_____something occurred which attracted my attention.

I felt somewhat disappointed and was about to leave,_____something occurred which attracted my attention.

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问题 I felt somewhat disappointed and was about to leave,_____something occurred which attracted my attention.
选项 A、unless
B、until
C、when
D、while
答案C
解析 when在该句中的意思为“在当时”，相当于at that time。
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