问题
选择题
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
答案
答案：C
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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
答案：C