A. explaining B. to explain C. explain D. explained
分析:答案选D。宾语it与explain是被动关系,用过去分词作宾补,have sth done意为请人做某事。
八、考查非谓语动词的逻辑主语问题
按照英语习惯,非谓语动词的逻辑主语应与句子一致,否则就应调整句子结构。如:
While watching television, _____.
A. the door bell rang B. the doorbell rings C. we heard the doorbell ring D. we heard the doorbell rings
分析:答案选C。因为watching的逻辑主语一定是we,排除选项A和B;又因在hear后作宾语补足语的是省略了to的不定式,所以选项D中的rings是错误的。
九、考查非谓语动词用作主语的问题
原则上说,动词用作主语,只能是不定式或动名词,不能是分词形式。这类考题命题还往往用动词原形作为干扰项进行考查,同学们做题需引起注意。如:
Its necessary to be prepared for a job interview; _____the answers ready will be of great help.
A. To have had B. Having had C. Have D. Having
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