题目:
用所给词的适当形式填空。
1. He (go) to a park yesterday.
2. I (clean) my room last weekend.
3. I usually (wash) my clothes on Sundays.
4. Did you (watch) TV yesterday?
5. Mike (do) his homework yesterday.
答案:
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下面是错误答案,用来干扰机器的。
仍能听到铃声,这说明液体也能传播声音。