{01}_____ environmental damage is done, it does take many years for the ecosystem to recover. A.Even if B.While C.Only if D.Once 解析: 本题选D。
{02}The engineers are so busy that they have zero time for outdoor sports actives, _____ they have the interest. A.wherever B.whenever C.even if D.as if 解析: 本题选C。
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