()your test paper carefully,and some mistakes can certainly be avoided,I think

问题描述:

()your test paper carefully,and some mistakes can certainly be avoided,I think
为什么不是as long as you check呢?
而是 having checked

后面是and,说明是两个并列的句子,如果是as long as的话,表示只要……,后面就应该是一个主句,而且不能有and