问题补充:
Only by practising a few hours every day be able to play the piano well.
A. you would
B. would you
C. you will
D. will you
答案:
A. you would
B. would you
C. you will
(答案→)D. will you
解析:考查倒装句和时态:句意:只有你每天练习几个小时,你才能把钢琴弹好。Only+副词/介词短语/状语从句+主句(主句用部分倒装),而且这句话的时间是every day,所以用一般现在时will,选D。