Ifwenowtoprotecttheenvironment

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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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相关试题

Two years later, her father disappeared, never to be _________ again.

A．heard from

B．hear about

C．hear of

D．heard out

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We want to encourage the students ________ the teaching.

A．to participate in	B．participate in
C．participating	D．participate to

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What he said was not relevant _________ the matter in hand.

A．in

B．to

C． for

D．at

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Those _________may leavetheclassroomnow.

A．whohasfinished	B．whohavefinished
C．havefinished	D．whomhavefinished

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When they saw the police car, the attackers turned and ________ .

A．flee

B．fleed

C．fled

D．slipped

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