The flowers his friend gave him will die unless___every day.
A．wateredB．watering
C．waterD．to water
A
unless后接省略形式。flowers和water之間是關系要用被動語態(tài)。同時unless從句的主語與主句的主語相同，常常省略其相同成分，故選A項，表示被動。動詞-ing形式表示主動；不定式常用作目的狀語。
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