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We must take measures to protect endangered wildlife ______it is too late.

A.now that            B.as long as           C.unless                D.before

We must take measures to protect endangered wildlife _______ it is too late.

       A. now that                  B. as long as                 C. unless               D. before  

We must take measures to protect the endangered wildlife ______ it

is too late.

   A.before         B.as long as      C.now that       D.unless

We must take measures to protect the endangered wildlife ______ it

is too late.

   A.before         B.as long as      C.now that       D.unless