In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources.
A.
has tried
B.
has been tried
C.
have taken
D.
have been taken
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举一反三
【判断题】A solar term is any of 12 points in traditional East Asian lunisolar calendars that matches a particular astronomical event or signifies some natural phenomenon.
【单选题】______ is responsible in any event for loss or damage to or in connection with the goods if their nature or value has been knowingly mis-stated by the shipper in the Bill of Lading.