The most interesting thing to the small boy was _______ he got close to the door, it would open of i...
2022-12-10 23:21:28 200次 2015届甘肃省高一下学期期中考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The most interesting thing to the small boy was
_______ he got close to the door, it would open of itself.
A．that as B．that that C．what that D．what when
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