___,I guess,and you can make it.A.If you make more efforts B.making more efforts C.a bit more efforts D.to have made mor

C and 链接并列句,要求前面是句子,而不是从句；a more effort 是一种省略,相当于一个祈使句.可以理解为：Make more efforts
希望可以帮到你!有疑问在继续提问.动名词和不定式为什么不行呢 是因为and是并列句嘛？对。非谓语单独不可以构成句子。