—Why did the car hit the boy?
—Because the driver _________ on the phone at that time.
A:talk
B:is talking
C:was talking
D:have talked
日本领土主要包括四大岛屿,其中面积最大的是( )
某化学兴趣小组利用MnO2和浓HCl及如图所示装置制备Cl2.下列分析中不正确的是( )