问题补充：
The teacher asked the students .
A. if they are interested in dinosaurs
B. when was Audery Heben born
C. What they will do with the computers
D. how many trees they had planted
答案：
A. if they are interested in dinosaurs
B. when was Audery Heben born
C. What they will do with the computers
(答案→)D. how many trees they had planted
解析：
试题分析: 句意：老师问学生们他们已经种了多少树。if they are interested in dinosaurs他们是否对恐龙感兴趣，when was Audery Heben born奥代拉.赫本什么时候出生的，What they will do with the computers他们会用电脑做什么， how many trees they had planted他们已经种了多少树。根据the teacher asked老师问，可知主句为一般过去时，宾语从句时态与过去时态相关，排除AC；宾语从句语序为陈述句语序，排除B，故选D。
