859.Jack _____ yet,otherwise he would have telephoned me.
A.mustn't have arrived
B.shouldn't have arrived
C.can't have arrived
D.need not have arrived
860.Mary was much kinder to Jack than she was to the others,______ of course,made all the others upset.
A.who
B.which
C.what
D.that
859.答案是C;can/could/have done sth…对现在已经完成情况的推测。
860.答案是B;此处which代表前面整个句子。
