题目内容
If____________ , the polluted air can result in deadly diseases or even death.
| A.being breathed in | B.having been breathed in |
| C.breathed in | D.breathing in |
C
解析
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题目内容
If____________ , the polluted air can result in deadly diseases or even death.
| A.being breathed in | B.having been breathed in |
| C.breathed in | D.breathing in |
C
解析