1991年后,()世界级大公司已经利用TRIZ理论进行产品创新研究,并取得了很好的效果。
A、摩托罗拉公司
B、波音
C、克莱斯勒
D、福特
参考答案:A, B, C, D
Yesterday, when I went to his office, he ______ online for some information. I think it will be an interesting lecture.
A.searched
B.was searching
C.would search
D.has searched