The flowers his friend gave him will die unless ______ every day.
A.watered
B.watering
C.water
D.to water
网友回答
A解析句意：如果不是每天浇水的话，朋友送他的那些花就会枯萎。本题考查unless引导的条件状语从句的省略问题。当条件状语从句的主语与主句主语一致时，可将从句的主语和be动词一起省去。其完整形式为：unless the flowers are watered every day.