Question

27. your essay carefully before you hand it in,some mistakes can surely be avoided,I think. A.Ha

27. your essay carefully before you hand it in,some mistakes can surely be avoided,I think.
A.Having checked B.Check
C.As long as you check D.While checking

Answer 1

解析:考查状语从句与非谓语动词的用法。由于句子的主语是some mistakes,和前面选项中所给的动词check不能形成逻辑上的主谓关系，所以不能用动词的�ing形式；两部分之间没有连词，也不能选B项；只有用从句才正确。
答案:C

Answer 2

some mistakes can surely be avoided As long as you check your essay carefully before you hand it in

as long as
只要

只要上交前你仔细检查下,一些错就可以避免.

Answer 3

C.As long as you check