It could be learned from the teacher's eyes he was very satisfied with her performance.A

问题补充：

It could be learned from the teachers eyes he was very satisfied with her performance.

A. that

B. whether

C. what

D. where

答案：

(答案→)A. that

B. whether

C. what

D. where

解析：答案：A。考查主语从句。句意：从老师的眼里可以看出老师对她的表演很满意。分析句子结构可以看出，前面的it为形式主语，真正的主语为that引导的主语从句，that无意义，不作成分，但是不能省略。

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