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题目内容
（安徽理工大学-电气工程及其自动化）
Televisions enable us to see things happen almost at the exact moment _____.
A、which they are happening
B、they are happening
C、which they happen
D、they have happened
A、which they are happening
B、they are happening
C、which they happen
D、they have happened
参考答案
