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therehavebeenmanychanges---inmyhometowninthelasttenyeasa||happenb||happenedc||happeningd||tohappen为什么答案选c说明理由
题目内容：
there have been many changes --- in my hometown in the last ten yeas
a\ happen
b\ happened
c\ happening
d\ to happen
为什么答案选c
说明理由优质解答
这是there be ...doing 的固定句型,译为有.事正在发生.本句用的是现在完成时.这才是正解.欢迎追问,
a\ happen
b\ happened
c\ happening
d\ to happen
为什么答案选c
说明理由
优质解答
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