16．The toughest thing about success is ________ you have to keep on being a success．（　�。�
A．whyB．whenC．whatD．that

分析 關(guān)于成功最難的事情是你必須要保持不斷成功的狀態(tài)．

解答 答案：D 題干中you have to keep on being a success是作is的表語，是一個表語從句；從句結(jié)構(gòu)完整，不缺少成分，不能用what來引導(dǎo)；句意表達的是事實，要用that來引導(dǎo)，并且不可省略．故選D．

點評 表語從句是名詞性從句的一種，在句中作系動詞的表語．表語從句的連接詞分為三種：從句缺少主語或賓語時，要用連接代詞；從句缺少狀語時，要用連接副詞；從句結(jié)構(gòu)完整，不缺少成分時，要用that來連接，且不可省略．

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