11．The earth became so violent that it was not clear ___________ the shape would last or not．（　�。�
A．ifB．howC．whetherD．why

分析 地球變得如此不穩(wěn)定以至于它能否保持它的形狀還是不知道的

解答 答案：C．根據(jù)it was not clear ___________ the shape would last or not說明前面it 是形式主語，而主語從句 the shape would last or not可知句子完整，不缺成分，排除ABD，再根據(jù)句意，能否保持它的形狀，故選C．whether是否…or not

點評 本題考查主語從句的連接詞，在充分分析句型基礎(chǔ)上以及熟知whether詞義的情況下便能選出正確答案．

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