back problems， always bend your knees when you lift heavy objects. A. AvoidingB. To avoid

发布时间：2020-08-17 12:22:41

     back problems， always bend your knees when you lift heavy objects.
A. Avoiding
B. To avoid
C. Having avoided
D. To be avoiding

网友回答

A. Avoiding
(答案→)B. To avoid
C. Having avoided
D. To be avoiding
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。
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