...measures should be taken to deal with the problem of...
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发布时间：2024-10-23 20:45
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A
选A 考查主语从句。分析句子结构可知，空处引导主语从句，且在从句中作主语，所以用what引导。注意区分以下结构：As is known to all, effective measures should be ...，其中As引导非性定语从句；It is known to all that effective measures should be ...，其中It为形式主语，真正的主语是that引导的主语从句。
