【练习】
1.Such________the case, I couldn"t help but?________?him.
A.being；support?? B.is；to support??
C.has been；supporting?? D.be；supported
答案：??A
解析：??can"t help but为固定短语， but后面接不带to的不定式；Such being the case为独立主格结构，the case为逻辑主语。
2. The article _________ on this subject was written by Mr.Black.
A. referring ? ?B. referred ? ?C. referring to ? D. referred to答案：?D
?解析：?过去分词作后置定语,意为"被提到的…".
3.?In order not to be disturbed, I spent three hours?________in my study.
A.locking?? B.locked?? C.to lock?? D.being locked答案：?B
解析：?lock与其逻辑主语应含有动宾关系，即 "被锁在书房里"。
4.?Will you lend him a magazine _________
A. to be read ? ? B. for reading ? ?C. to read ? ?D. he read答案：?C
解析：?不定式作定语,to read 的逻辑主语是间接宾语him.
5.?The little boy still needs the _____ (remain ) 20 dollars to do ?with some things _____(remain; settle).（填空练习）
答案：remaining;?remaining to be settled?
解析：?第一个remaining用作形容词，作“剩下的”解；第二个remaining to be settled 是-ing形式短语作定语。
6.Mr. Smith was much surprised to find the watch he had had _____(repair) was nowhere to be seen.（填空练习）
答案：?repaired
解析：?he had had repaired是省去了关系代词that/ which的定语从句。
【小知识】动词不定式构成
1、疑问词 + 动词不定式：疑问代词和疑问副词后可加动词不定式构成不定式短语，在句中可作主语、表语或宾语，如：How to prevent them from swimming in this river is a problem.
2、动词不定式的否定式：动词不定式的否定式是由not + 动词不定式构成，如：It’s wrong of you not to attend the meeting.?
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