5.B.因句中有连词and,所以and 之前必须是一个并列关系的分句.

4.C.with the door open是with 的复合结构,open 为形容词,表状态; stood与came, entered为并列关系,在句中作谓语.

3.B.-ing形式短语作状语,且think(思考)表示的动作发生于give a satisfactory answer之前,故用having thought.

2.D.expect后跟不定式作宾语,call与doctor之间是被动关系.

1.A.fix one’s eyes/attention on/upon为固定短语,意为“注视,注意”,故此处应用过去分词形式作宾语补足语.

100. Tigers _____ meat-eating animals _____ meat.

A. belonged to; fed on　　 B. belonging to; feed on

C. were belonged to; feed on　　 D. belonging to; feeding on

答案及部分解析：

99. Last night I saw Yang Weiwei lying in bed, _____in deep thought.

A. lost　　 B. losing　　 C. to lose　　 D. being lost

98. - I would like to buy an expensive camera.

　 - Well. We have several models _____.

A. to choose from　 B. of choice　　 C. to be chosen　　 D. for choosing

97. As the stone was too heavy to move, I left it _____on the ground.

　　 A. laying　　　 B. lay　　　　 C. lying　　　　 D. lain

96. The purpose of new drugs used on patients is to make them less painful, _____ them more terrible.

A. not make　 B. not to make　 C. not making　　 D. do not make