I told Sally how to get there,but perhaps I ( ) for her.

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I told Sally how to get there,but perhaps I ( ) for her.
A.must have written it out
B,had to write it out
C.ought to write it out
D.should have wriiten it out.
为什么?

一道高中英语选择题,
I told Sally how to get there,but perhaps I ( ) for her.
A.must have written it out
B,had to write it out
C.ought to write it out
D.should have written it out.
答案是A 为什么?
答：因为参考答案印错了.
分析：A.must have done sth.是对过去情况的肯定的判断（推测）.I must have written it out for her.我当时肯定写下来给了她的.这与but,和perhaps都是矛盾的.如将but perhaps 改为and,选A还差不多：我告诉过沙丽怎么去那儿,而且我一定是（将如何去的方法）写下来给过她的.
有了这个but perhaps,就只能选D了.表示过后的自我批评.（Sally 没有找到那个地方）.因为当时只是口头跟她说如何去,没有写下来.现在想来,也许我本该写下来给她的.

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