A farmer_____to see a UFO on a clear night too weeks ago.A took place B used C was used D happend
问题描述：
A farmer_____to see a UFO on a clear night too weeks ago.A took place B used C was used D happend
答
D,happen to do something 偶然做某事.一个农民偶然在在两周之前的一个晚上看见了不明飞行物.something take place某件事情发生了,这里主语不是物,是人,所以不适用.