Ifwedon’tdoourbesttoreducepoll

--If we don’t do our best to reduce pollution, man’s history won’t last long.
--_________.

A．It’s OK	B．You are absolutely right
C．That’s all right	D．Mind your own business

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A．beginning	B．began
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A．must send a doctor

B．a doctor be sent for

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A．served	B．has served
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