组卷网 > 高中英语综合库 > 单词辨析 > O > observe
题型:单项选择 难度:0.4 引用次数:196 题号:19287857
If __________ (observe) the golden rule: reduce, reuse and recycle, we can make a better world for our next generations.
A.observedB.observing
C.having observedD.not observing

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