从属连词(because、although、that等)一定要连接两个句子。状语从句一般是以从属连词(because、although、since、as等)连接两个单句。如，Because
it is so serious.Many countries do not take any real countermeasure.Because引导的是一个从句，缺少主语。因此，应该改为，Because it is so serious,many countries do not take any real countermeasure.
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从属连词(because、although、that等)一定要连接两个句子。状语从句一般是以从属连词(because、although、since、as等)连接两个单句。如，Because
it is so serious.Many countries do not take any real countermeasure.Because引导的是一个从句，缺少主语。因此，应该改为，Because it is so serious,many countries do not take any real countermeasure.