一道英语选择题“I can not see the blackboard very well ” “perhaps you need ——”A to examine your eyes B to have examined your eyesC having your eyes examined D to have your eyes examined
问题描述：
一道英语选择题“I can not see the blackboard very well ” “perhaps you need ——”
A to examine your eyes
B to have examined your eyes
C having your eyes examined
D to have your eyes examined
答
need to 检查眼睛，用被动表示 to have your eyes examined
选D
答
D
need to do sth 需要做某事，
have sth done 检查什么
答
d
have sth. done
答
D
答
选D首先need to do 需要做某事,用不定式.其次have sth done 请（某人）做某事.也就是说,have your eyes examined 让（医生）检查你的眼睛.但是是A中没有表达出这类意思,而B中have done sth 是完成时,意思为曾经做过...
答
D to have your eyes examined
need to do
have sth done
答
本题选B.
这里考察虚拟语气的用法，need to have done表示本应做某事，但没做，这句意为我看不太清楚黑板；或许你早该去检查下眼睛了。