—What did he say just now? —He said .A. what tim the library was build.B. he has made many

问题补充：

—What did he say just now?

—He said .

A. what tim the library was build.

B. he has made many mistakes in the exam.

C. if the teacher would ask him to go to the office the next day

D. his mother had waited for him for 20 minutes at the school gate.

答案：

A. what tim the library was build.

B. he has made many mistakes in the exam.

C. if the teacher would ask him to go to the office the next day

(答案→)D. his mother had waited for him for 20 minutes at the school gate.

解析：句意：---他刚刚说什么呢？---他说他妈妈在校门口已经等他等了20分钟。因为主句的谓语动词是said用的是过去式，所以从句的谓语动词应该用过去完成时，故排除ABC；故选D。