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题目
题型:不详难度:来源:
_____ back problems, always bend your knees when you lift heavy objects.
A.AvoidingB.To avoid
C.Having avoidedD.To be avoiding

答案
B
解析
用于句首表示目的,要用不定式。句意为:为了避免以后出现问题,当你搬动重东西时,一定要将膝盖弯曲着。
核心考点
试题【_____ back problems, always bend your knees when you lift heavy objects. A.Avoid】;主要考察你对现在分词等知识点的理解。[详细]
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