题目内容
7．You never play the piano well _________you practice it again and again．（ ）| A． | if | B． | since | C． | unless | D． | after |
分析 除非你反复练习，否则你永远不会弹好钢琴．
解答 答案：C．
本题考查的是从属连词的辨析．根据题意，从主句句意"你永远不会弹好钢琴"和从句句意"你反复练习"来看，这里需要一个表假设的连词，结合选项，unless可以引导一个表假设的条件状语从句，意为"除非"，相当于if not．故选C．
点评 本题主要考查连词的用法，做此类题目一定要弄清句意，明白上下文之间的关系，才能更好地判断出所要用的连词．再就是要熟记固定短语和句型．
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