单项选择题

The passage suggests that ______.

A．safety regulations effectively prevent the accidents at work
B．with all the safety precautions, accidents at work cannot be avoided
C．the human error or misjudgment leading to accidents at work is mainly due to working environment
D．both B and C

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单项选择题

People used to think that ______.

A．car accidents are mainly caused by some drivers who drive so carelessly that they break the traffic regulations
B．car accidents are mainly caused by ordinary drivers when they are careless or absent-minded for a moment
C．insurance companies support those who drive carelessly
D．an accident is something we cannot predict to avoid

单项选择题

We ______ to tell him the good news but found that he wasn't in.

A．means
B．had meant
C．is meaning
D．has meant