there have been many changes_____in my hometown in the last twenty years.there have been many changes_____in my hometown in the last twenty years.A.happen B.happened C.happening D.to happen
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![there have been many changes_____in my hometown in the last twenty years.there have been many changes_____in my hometown in the last twenty years.A.happen B.happened C.happening D.to happen](/uploads/image/z/6124637-29-7.jpg?t=there+have+been+many+changes_____in+my+hometown+in+the+last+twenty+years.there+have+been+many+changes_____in+my+hometown+in+the+last+twenty+years.A.happen+B.happened+C.happening+D.to+happen)
there have been many changes_____in my hometown in the last twenty years.there have been many changes_____in my hometown in the last twenty years.A.happen B.happened C.happening D.to happen
there have been many changes_____in my hometown in the last twenty years.
there have been many changes_____in my hometown in the last twenty years.
A.happen B.happened C.happening D.to happen
there have been many changes_____in my hometown in the last twenty years.there have been many changes_____in my hometown in the last twenty years.A.happen B.happened C.happening D.to happen
C
happening动词ing形式happening in my hometown 修饰前面的changes
B 后面到hometown是定语修饰changes A显然不行C正在进行的动作D将要发生的动作
应该选C
B.happened
从后面的in the last twenty years.来确定这里的时态,应该是过去发生的事情了,所以用happened 这个动词过去时。