The lawn will turn brown unless _____ frequently.

A. watered
B. watering
C. water
D. to water
A
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科目:高中英語(yǔ) 來(lái)源:陜西省模擬題 題型:單選題

The lawn will turn brown unless _____ frequently.
[     ]
A. watered
B. watering
C. water
D. to water

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