Ifwenowtoprotecttheenvironment

If we ________ now to protect the environment, we’ll live to regret it.

A．hadn’t acted	B．haven’t acted
C．don’t act	D．won’t act

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A．

Not realized

B．

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C．

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D．

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B．

none

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A．whom

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B．will be tested

C．is being tested

D．has been tested

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Some children want to challenge themselves by learning a language different from ______ their parents speak at home.

A．what

B．that

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