19．There is a saying，"Life is 10% ____ happens to us and 90% ____ we respond to it．"（　　）
A．that； thatB．which； whenC．what； howD．who； why

分析 常言道，生活是由一成的客觀現(xiàn)實和九成的主觀回應組成的．（類似于三分天注定，七分靠打拼．）

解答 答案：C 題干中happens to us是作系動詞的表語，是一個表語從句；從句中happens缺少主語，要用連接代詞；后面的同樣是表語從句，從句結(jié)構(gòu)完整，要用連接副詞．故選C．

點評 在句子中起名詞作用的各種從句統(tǒng)稱為名詞性從句．根據(jù)它們在句中的語法作用，這類從句又可分為主語從句、同位語從句、表語從句和賓語從句．

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