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
答案:C
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题目内容
If ________, the polluted air can result in deadly diseases or even death.
being breathed in
having been breathed in
breathed in
breathing in