---Look! The telephone is broken. Someone damaged it ________ purpose.
---That may be right. But perhaps it was broken _________ accident.
| A．on; by | B．by; by | C．on; on | D．by; on |
相关试题
Scientists are convinced the positive effect of laughter physical and mental health.
| A．of; at | B．by; in | C．of; on | D．on; at |
If you really have to leave during the meeting, you’d better leave ____ the back door.
| A．for | B．by | C．across | D．out |
Let’s learn to use the problem we are facing ________ a stepping-stone to future success.
| A．to | B．for | C．as | D．by |
The house still needed a lot of work, but _______the kitchen was finished.
| A．instead | B．altogether | C．at once | D．at least |
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