These students are quick at learning. We'll have them with new methods.
A. training
B. to train
C. to be trained
D. trained
网友回答
A. training
B. to train
C. to be trained
(答案→)D. trained
解析：本题是对动词使用的考查。have在英语中是一个极其重要的词，它的用法有很多。此题中have sb．trained表示“给他们用新方法训练”。