【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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