[单选题]Looking at him, we found（）hard to believe that he was well over seventy.

that

what

正确答案：C

题目解析

空格前面有谓语动词found，后面believe that之前没有谓语，说明空格处不能填连词，不选AD。后面有to do，说明空格处应该填it，it为形式宾语，to do 为真正的宾语。选C。句意：看着他，我们很难相信他已经70多岁了。

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[单选题]Looking at him, we found（ ）hard to believe that he was well over seventy.