There____great changes in our country since 1979A have been B were Chas been D are?选哪个?
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![There____great changes in our country since 1979A have been B were Chas been D are?选哪个?](/uploads/image/z/3310159-31-9.jpg?t=There____great+changes+in+our+country+since+1979A+have+been+B+were+Chas+been+D+are%3F%E9%80%89%E5%93%AA%E4%B8%AA%3F)
There____great changes in our country since 1979A have been B were Chas been D are?选哪个?
There____great changes in our country since 1979
A have been B were Chas been D are?选哪个?
There____great changes in our country since 1979A have been B were Chas been D are?选哪个?
选 A have been
因为后面的时间词 since 1979,表示的是从1979年以来,所以用完成时.
而主语 great changes 是复数,所以用 have been.