_____ back problems， always bend your knees when you lift heavy objects. A．Avoid
题型：不详难度：来源：
_____ back problems， always bend your knees when you lift heavy objects. | A．Avoiding | B．To avoid | | C．Having avoided | D．To be avoiding |
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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。 |
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