答案是C
这句话的意思是眼见为实（必须见到了才能相信）,而have to 含有不得不,必须的意思.
seen 是过去分词,被看到,要用被动语态.
It_seen to be believed.A.has B has been C.has to be D.was
It_seen to be believed.A.has B has been C.has to be D.was
英语人气：203 ℃时间：2020-05-22 23:16:29
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