【题目】The helicopters ________ water on the plants. （ ）
A. drops B. are drop C. are dropping
【答案】C
【解析】
句意：直升机......在植物上......水。根据句意这是现在进行时的句子，这里用be +动词的现在分词，A选项是单三形式，B选项是：be+动词原形，C选项是：be +动词的现在分词。故答案为：C.
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