PS:请写出为什么
问题描述：
PS:请写出为什么
1.Surprisingly,Susan ___ all the jokes she had heard at school by the time she got home.
A.has forgotten B.had forgotten C.forgot
2.To my great surprise,Tom looked quite different ____ I had expected.
A.in which B.in that C.from what D.for which
3.Your 12-year-old brother ____ think your visit to the Fine Arts Museum was funny.
-But I was not interested in it at all.
A.does B.did C.has to D.had to
答
B by the time就是前文出现完成时标志,而by the time 后面根的过去时,所以选过去完成时
2.C different from 是搭配
3.B did表示强调,过去时的原因是作者用的was not.