we have realized the danger of over-consumption, some measures should be adopted as soon as possible.
A. Now that
B. As long as
C. In order that
D. Even if
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(答案→)A. Now that
B. As long as
C. In order that
D. Even if
解析：考察连词辨析。A既然；B只要；C为了；D即使；句意：既然我们已经意识到过度消费的危险，要尽可能快采取一些措施。根据句意说明A正确。