1.So many students get failed in the final examination.It is strange that such a thing __1__in your school.It is important that the results of an experiment__2___.

　　1. [a]happens [b]happened

　　[c]should happen [d]had happened

　　2.[a]check and recheck [b]checking and rechecking

　　[c]be checked and rechecked [d]checked and rechecked

　　2.The people who knew him very well said that he was too naïve sometimes.Had he been older,he___1___less sympathetic.But what he had done proved that he was the person,loving life,also a hero who can help others out of trouble.___2___his timely arrival, the boy would have been drowned.That gained respects for him.

　　3.[a]might have been [b]would be

　　[c]might be [d]had been

　　4.[a]But for [b]Even for

　　[c]Except for [d]If not

　　1. 選[c]該題考察表示驚奇、高興、遺憾、擔心等感情色彩的形容詞引起的主語從句中的虛擬語氣的表達。在 anxious,sorry,concerned,happy,delighted等表示感情色彩的形容詞后接的that 從句中，用should來修飾謂語動詞。該句中有strange一次，意為“奇怪”，表示對事物的驚訝或不滿，it為形式主語，that從句為主語從句，要求從句中用虛擬語氣的表達形式should+動詞原形表示

　　2. 選[c]該題考察it’s+adj.+that主語從句的虛擬形式。觀察句子結構可以看出這里為It’s+形容詞(important)+that從句結構，形容詞important做表語，主語從句需要虛擬形式should+動詞原形，should可以省略

　　3. 選[a]該題考察非真實條件的虛擬。在表示過去情況的虛擬條件句中，條件從句用了過去完成時形式，主句可用should(would/could/might)+have+過去分詞的形式

　　4. 選[a]該題考察含蓄條件的虛擬。But for含義為“要不是”，用于此處可以表達假設條件，but for his timely arrival=If it had not been for his timely arrival或If he had not arrived on time.