Things were very expensive those days.You_______ a very good

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Things were very expensive those days.You_______ a very good dinner if you only paid 10. A.can't have B.may have C.can't have had D.may have had
Is it ___ that professor Black will come to visit China again? A.sure B.certain C.really D.truly

2 选B certain
Sure与certain是近义词,均作“一定的,确信的”等解.两者用法相似,多数情况下可换用,但有时不能换用.
在“It is…that结构中只能用certain,不能用sure.例如：
It is certain that he will come. 毫无疑问他会来
It was certain that our football team would win the game. 我们的足球队无疑会赢得比赛
如是否定句,用whether,不同that.例如：
It is not certain whether he will come. 他来不来还不一定.
题目疑问句,同理教授确定还会再来中国吗?
1 选C
can/could + have + 过去分词
表示对过去某种情况怀疑或者不确定
can和could一般用于否定句和疑问句,could语气较弱
例句
He can't have finished the work so soon
他不可能这么快完成工作
I didn't see her at the meeting this morning；she can't/couldn't have spoken at the meeting
今天早上我没看到她出席会议,她不可能在会上发过言.
题目那些日子物价很高,你只花10块钱是不可能吃到什么好东西的

Things were very expensive those days.You_______ a very good they sell those watches ( ) a very good ( ) I buy things（）a very good price 是 We sell our things at a very good price. 一个英语句子的疑问A:Were they very expensive?B:I never could have bou They got those magazines____a very good price. This is a very expensive machine With things as they are very good Those flowers ①they gave us②with a card③were④very beautiful. Those are very cheap things in the shop.同义转换 These ________are very expensive.. ___tusks are very expensive.