So, ________ the government has a good system of control or can educate the people, the forests will slowly disappear.
A．a(chǎn)s long asB．whenC．unlessD．every time
C
連詞辨析。   A. 只要 B. 既然 C. 除非；如果不   D. 每當(dāng)。句意：因此，除非政府有一個(gè)好的控制系統(tǒng)或者能教育人們，否則森林會(huì)慢慢消失。故選C。
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