2.The teacher asked us _____ (不要搞出) so much noise.

省略

1.The patient was warned _____ oily food after the operation.

A. to eat not　　　 B. eating not　　　 C. not to eat　　　 D. not eating

3. Viruses that like to reproduce in the cells inside the human nose and throat.are believed____theflue.　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 　　　A.causing　 B being causing　 C to be caused　 D to cause　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 逻辑主语

　 It is high time people in Central Australia shot the camels.　　　　　　　　　　　

It is time ____people in Central Australia _____　 _____the camels.

否定形式：

2. The flue is believed _____ by viruses that like to reproduce in the cells inside the human nose and throat.

A. causing 　　B. being caused　　 C. to be caused　　　 D. to have caused

1.Little Jim should love ____ to the theatre this evening .

A. to be taken　　　 B. to take　　　　 C. being taken　　 D. taking

5.It was raining heavily.They could do nothing but _____ at home.

　 A. to stay　　　　 B. stay

被动语态

4.It was raining heavily.They didn’t have any choice but _____ at home.

A. to stay　　　　 B. stay

3.　　 I can’t help _____ that we have no right to destroy nature.

A. think　　　　 B.thinking　　　 C.but think　　　　　 D.but to think

(do) but do

sth. but to do

2.　　 On hearing the news she can’t help _____.

A. laugh　　　　 B. laughing　　 C.but laugh　　　　　 D. but to laugh

1.　　 I’m afraid I can’t help ____the house because I have a meeting to attend right now.

A.clean　　　　 B.cleaning　　　 C. but　 clean　　　　　 D. but to clean