霍尔式曲轴位置传感器是利用霍尔效应原理，产生与曲轴转角相对应的电压脉冲信号的。（）
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曲轴位置传感器主要可分为磁脉冲式、光电式和霍尔式三大类。（）
A. 错误
B. 正确
They soon______ serious trouble（）
A. ran after
B. followed
C. had
D. ran
Mr. Ian Thompson ______a public house a short time ago（）
A. has bought
B. bought
C. was bought
D. is bought
It occurred to him to open it. He thought ______it（）
A. of opening
B. to open
C. to have opened
D. opening
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