问题
选择题
I would be happier if you did more studying while you are free, but you ___________.
A．don’t
B．didn’t
C．wouldn’t
D．weren’t
答案
答案：A
如果你空闲时多学习学习我会很高兴，但是你不这样做。But为转折连词，前后时态应该一致，would为虚拟语气一般现在时态，所以but后面应为一般现在时。