Unit 4 Learning efficiently
a. had scored b. scored c. would score d. would have scored
解析：从逻辑的角度看，转折副词otherwise后面总是要接虚拟语气。该句中hesitated是过去时态，故选d。
4. mr. white _____ at 8:30 for the meeting, but he didn’t show up. (广西)
a. should have arrived b. should arrive
c. should have had arrived d. should be arriving
解析：8:30就应到达，但是现在还没有出现。should含有轻微的指责意。故选a。
5. –i’ll tell mary about her new job tomorrow. 23. (福建)
–you _____ her last week.
a. ought to tell b. would have told c. must tell d. should have told
解析：原因同上。故选d。
6. i was really anxious about you. you _____ home without a word. (全国)
a. mustn’t leave b. shouldn’t have left c. couldn’t have left d. needn’t leave
解析：你不应该一句话不说就离家出走的，但是你却这样做了，用虚拟语气。故选b。
3）与将来事实可能不符的条件句
if it were to rain this afternoon, the football match would be put off till next friday.如果今天下午下雨，足球赛就推迟到下一周星期五。
did tom come tomorrow(=if tom came tomorrow), we should show him around our campus.如果汤姆明天来，我们应该带领他参观我们的校园。
if they should play the match against us, we should get the team well organized and try our best to beat them.如果他们真的和我们打比赛，我们应该好好地组织并努力战胜他们。
注意：⑴条件句引导词if若被省略，该条件句则倒装。⑵在实际使用中，虚拟语气和陈述语气会出现在同一主从复合句里。所以，我们要注意混合语气、混合时态的使用。比如：
if i had known her earlier, i might have fallen in love with her. but what a pity, now she has been other’s bride.我如果早一些时候认识她，我也许会爱上她的。可是，可惜啊，她现在成了别人的新娘。
if i had been informed yesterday, i should know what to do now.昨天要是有人告诉我，我现在就知道做什么了。
真题：
i _____ pay tracy a visit, but i’m not sure whether i will have time this sunday. (浙江)