题目内容
【题目】用单词的适当形式填空。
1. Are you _______ (write) a letter?
2. They _______ (play) football now.
3. Look! Who _______ (run) fast in the playground?
4. Don’t go out. It _______ (rain) now.
【答案】1. writing 2. are playing 3. is running 4. is raining
【解析】
略
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