单项选择题
In some parks visitors are requested to keep () the grass.
A. aside
B. away
C. out
D. off
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单项选择题
(Survival) in the desert has always (depended in) the (availability) of (water).()
A. Survival
B. depended
C. availability
D. water
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单项选择题
We hurried to the station______find ourselves three hours earlier for the train.
A. only to
B. in order to
C. so as to
D. such as to
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