It is not clear the effects of global warming will be.A．howB．whichC．thatD．what 题目和参考答案——青夏教育精英家教网—

It is not clear ____the effects of global warming will be.

A．how

B．which

C．that

D．what

试题分析：考查名词性从句的主语从句。本题的it是形式主语，真正的主语是what the effects of global warming will be. what在句中做表语。句意：全球变暖的影响是什么现在还不清楚。故D正确。
点评：名词性从句的考查集中在引导词的选择上，连接词that, whether, if在句中不充当任何成分，只起连接作用；连接代词who(ever), which(ever), whom(ever),whose(ever),what(ever)在句中做主语，宾语，表语和定语；连接副词when, why, where, how，在句中做状语。应从上下句的句法关系着手分析，切不可‘望句形生答案’总的来说，考生在解答此类型时，可用排除法或造句法，造句法就是仿造原句的语法功能仿造出一个易懂易理解的句子，帮助判断。

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