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19.There is no doubt ________ the earth is becoming warmer and that it is human activity ________ has caused this global warming rather than a random but natural phenomenon.(  )
A.whether; whetherB.whether; that
C.that; thatD.that,whether

分析 毫无疑问全球正在变暖这是人类的活动造成的全球变暖而不是一个自然的现象.

解答 C 考查名词性从句和强调句.分析提干可知第一个从句the earth is becoming warmer 是一个同位语从句,是对于doubt的解释,根据句意"毫无疑问地球正在变暖",所以答案用that;第二个句子是强调句,被强调部分是human activity,根据强调句的固定结构It is/was+被强调部分+that+句子的剩余部分.所以答案是that.故答案选C.

点评 本题是一个复杂句,解题的关键是分析句子的在句中充当的成分和句型.然后根据不同的句型逐一进行解答.

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