A:would drive
B:had drive
C:has been driving
D:drove
The city was founded in the 8th century BC. In 89 BC, the Romans ____ Pompeii.
单层石墨称为石墨烯,这种“只有一个碳原子厚的碳薄片”被公认为是目前世界上最薄、最坚硬、传导电子速度最快的新型材料,下列关于石墨烯的叙述中正确的是( )