was to do&was to have done

was to do&was to have done

题目
was to do&was to have done
the results were to___yesterday,but we have heard nothing
A.announce B.be announcing C.be announced D.have been announced
正确答案选哪一个
答案
C
to后面加动词原形
result被宣布,有个被动,要用be动词加过去分词
所以是be announced.
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