［考题1］ ____ you’ve got a chance, you might as well make full use of it.

A. Now that

B. After

C. Although

D. As soon as

答案选 A。解析 主句与从句之间存在因果关系， 且“you’ve got a chance”表示一个显而易见的原因， 因此应选用表原因的now that。

［考题2］ He found it increasingly difficult to read, ____ his eyesight was beginning to fail.

A. and

B. for

C. but

D. or

　答案选B。解析“his eyesight was beginning to fail”是“he found it increasingly difficult to read”的原因， 因此本题应选用可以表示原因的连词for引导原因状语从句。

［考题3］ A man cannot smile like a child, ____ a child smiles with his eyes, while a man smiles with his lips alone. (2006湖南)

A. so

B. but

C. and

D. for

答案选D。解析 下划线处之后的句子补充说明“a man cannot smile like a child”的原因， 应选用for表原因。