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【题目】写出下列单词的过去式。

1wash ________

2clean ________

3watch ________

4do ________

【答案】

1washed

2cleaned

3watched

4did

【解析】

1wash的过去式是规则变化washed,故答案为washed

2clean的过去式是规则变化cleaned,故答案为cleaned

3watch的过去式是规则变化watched,故答案为watched

4do的过去式是不规则变化did,故答案为did

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