介绍:
Unit19 用现在完成时表示从过去某一时间到说话时这段时间中反复发生的动作
1. I've often heard her sing.
2. She has always walked to school.
3. She has attended classes regularly.
4. I have been to the Great Wall twice.
5. I have never seen such a beautiful bird.
6. I have seldom made grammatical mistakes.
7. He has never lost confidence in a brght future.
8. I have learnt about two hundred English words this month.
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