we can not figure out ____quit a number of insects ,birds ,and animals are dying out .
A．thatB．a(chǎn)sC．why D．when
C  
figure out后接賓語從句，根據(jù)從句要表達的意思“為什么很多昆蟲，鳥，和動物在逐漸滅絕”
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