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D.  Exercise Explanation

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                   A.  Skill 2: Be careful of object of preposition

               An  object  of  preposition  is  a  noun,  pronoun,  gerund  or  a  noun  clause  which  comes  after  a
               preposition, such as in, at, of, to, by, behind, on, and so on, to form a prepositional phrase. An
               object of preposition can cause confusion in structure questions on TOEFL test because it can be
               mistaken for the subject of a sentence


                               Nouns, pronoun, gerund                Subject


                                   or a noun clause              =



                Preposition: in, at, of, to,                     Nouns, pronoun, gerund    ≠       Subject
                                                           +        or a noun clause
                        by, behind, on


               After his exam Tom will take a trip by boat

               After his exam and by boat are objects of preposition

               Tom is the subject
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