Having suffered from serious pollutions, he made up his mind to devote his life to __________ pollution from __________ again.
A.preventing; happening |
B.prevent; happen |
C.preventing; happens |
D.preventing; will happen |
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Having suffered from serious pollutions, he made up his mind to devote his life to __________ pollution from __________ again.
A.preventing; happening |
B.prevent; happen |
C.preventing; happens |
D.preventing; will happen |