A.to prevent; being polluted | B.preventing; polluting |
C.preventing; being polluted | D.to prevent; polluting |
A.not inviting | B.being not invited | C.not being invited | D.not to be invited |
A.cause | B.caused | C.to cause | D.causing |
A.to be covered | B.to have covered | C.to be covering | D.to cover |
A.tired of doing | B.tired with doing |
C.tiring to do | D.tiring with doing |
A.being laughed | B.laughing | C.to laugh | D.to be laughed |
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