We cannot figure out ________ quite a number of insects, birds, and animals are dying out.    
A．thatB．a(chǎn)sC．whyD．When
C
主要測(cè)試賓語從句。分析句子結(jié)構(gòu)可知：動(dòng)詞短語figure out缺少賓語從句，同時(shí)后面句子中缺少狀語，再結(jié)合答案可知能做狀語引導(dǎo)賓語從句的詞只有C和D，但是when又不符合語境。句子意思：我不能理解為何許多昆蟲、鳥兒和動(dòng)物瀕臨滅絕。例如：The teacher didn't figure out why the youngest boy in the class was always being late for school。老師不理解為何年齡最小的男孩上學(xué)總是遲到。
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