题目内容
3. It is ( possible) for humans to live on Mars at pres- ent.
4. Isn’t it strange that the cat is used to ( lie) beside the dog peacefully?
3. impossible 4. lying
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题目内容
3. It is ( possible) for humans to live on Mars at pres- ent.
4. Isn’t it strange that the cat is used to ( lie) beside the dog peacefully?
3. impossible 4. lying