摘要：Everyone should make a contribution to the environment. A. protect B. protected C. protecting D. protects
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Everyone should make a contribution to ________ the environment.
[
]|
A ．protect |
B ．protects |
C ．protected |
D ．protecting |
Everyone should make a contribution the environment.
|
A．to protect |
B．to protecting |
C．protects |
D．protected |
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