| 成人英语三级考试易错题（2018/3/8） |
| 第1题：He is said to ______ the old couple for more than ten years. A．have looking after B．be looking after C．look for D．have been looking after |
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| 第2题：During the discussion, Mr. Boyd remained silent when asking his opinion. A．During the discussion B．remained silent C．when D．asking |
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| 第3题：Before the drug is used on human beings, experts have to ______ dogs.
A．be experimented B．experiment C．experiment with D．experiment on |
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| 第4题：—How often do you drop your e-pal a line — ______ , but usually once a week. A．As usual B．It depends C．Generally speaking D．Have no idea |
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| 第5题：New ways have been found to prevent the river ______. A．not to be polluted B．against polluting C．from polluting D．from being polluted |
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