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

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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
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

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
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,意思为曾经做过某事（而此事对现在造成影响或者在现在此时而言的某种表述表达）
明白吗?

D to have your eyes examined
need to do
have sth done

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。

d
have sth. done

D
need to do sth 需要做某事，
have sth done 检查什么

need to 检查眼睛，用被动表示 to have your eyes examined
选D