The flowers his friends gave him will die if _______ every day.
A.not watering
B.not watered
C.not to water
D.not being watered
网友回答
B解析考查状语从句的省略。补充完整是The flowers his friends gave him will die if they are not watered every day.因为从句主语和主句主语一致，并含有be动词，可把从句的主语和 be省略。所以选B。