9. It's very hot here in summer. So the workers are required that        at least once a day. (water)

這兒的夏天太熱了，所以工人們應該至少每天給花澆一次水。

9. they ( should) water the flowers動詞require 后的賓語從句中的謂語動詞部分應該用should do,should可以省略。

題目來源：高考英語組合訓練多項選擇+完成句子 > 組合訓練41-42

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