摘要：20． stopping polluting the earth hope to live in a better environment． A．Only to,we can B．Only to:can we C．Only by,can we D．Only by,we can
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______stopping polluting the earth______hope to live in a better environment．
A．Only to；we Call B．Only to；can we C．Only by；can we D．Only by；we can
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______stopping polluting the earth______hope to live in a better environment．
| A．Only to；we Call | B．Only to；can we | C．Only by；can we | D．Only by；we can |
________ stopping polluting the earth_________ hope to live in a better environment．
A．Only to；we can B．Only to：can we
C．Only by；can we D．Only by；we can
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