–I tried many times, but I still failed in the experiment.
--Don’t be discouraged. and the problem will be settled.
A. Having a little effort
B. There is a little effort
C. If you have a bit effort
D. A bit more effort
网友回答
A. Having a little effort
B. There is a little effort
C. If you have a bit effort
(答案→)D. A bit more effort
解析： 略