题干
The teacher spoke loud and clearly enough to make himself ________ by all his students.
A：hear
B：heard
C：hearing
D：to hear
答案(点此获取答案解析）
B
The teacher spoke loud and clearly enough to make himself ________ by all his students.
A：hear
B：heard
C：hearing
D：to hear
所用的时间为t1，紧接着通过下一段位移