问题描述：
--I tried many times,but I still failed in the experiment.
--Don’t be discourage d． ____ and the problem will be settle ．
A． Making a little effort B． There being a little effort
C． If you make a bit effort D． A bit more effort
选D ,A为什么不行?解释选项A\B\C\D谢谢
--Don’t be discourage d． ____ and the problem will be settle ．
A． Making a little effort B． There being a little effort
C． If you make a bit effort D． A bit more effort
选D ,A为什么不行?解释选项A\B\C\D谢谢
问题解答：
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