The temperature of our earth will become higher and higher _____ we take actions right now.

A. unless
B. if
C. as soon as
D. as
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科目：初中英語 來源：河北省模擬題 題型：單選題

The temperature of our earth will become higher and higher _____ we take actions right now.

[     ]

A. unless
B. if
C. as soon as
D. as

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