---I had practiced my spoken English, but still failed in the oral test.-Don’t be disco

---I had practiced my spoken English, but still failed in the oral test.
---Don’t be discouraged. and you will surely pass it.
A. Make a bit more effort
B. To make a bit more
C. Making a bit more effort
D. If you make a bit more effort

(答案→)A. Make a bit more effortB. To make a bit more C. Making a bit more effortD. If you make a bit more effort解析：本题中含有特殊句式：祈使句+连词+陈述句=If引导的条件句+主句。这个句型进一步转换成：名词短语+连词+陈述句。如果原句中的连词是and,那么可以转换成一个肯定的条件句；如果原句中的连词是or，可以转换成一个否定的祈使句。句义：在努力一点，你就一定会通过的。相当于：If you make a bit more effort, you will surely pass it。故A正确。

就是这个解释