Televisions enable us to see things happen almost at the exact moment________.

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问题 Televisions enable us to see things happen almost at the exact moment________.

选项 A、which they are happening
B、they are happening
C、which they happen
D、they have happened

答案B

解析 本题考查定语从句。先行词为the moment时,定语从句的关系副词应该用when,when。可以省略,故排除A项和C项。根据at the exact moment可知,从句表示的是事情正在发生的时刻,应用现在进行时,故排除D项,答案为B项。
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