题目列表(包括答案和解析)
the chair is very comfortable to sit on该句中的不定式与主语有动宾关系，因此必须是及物动词，不及物动词则该加上适当的介词。
动词的分类：行为/实义动词、及物与不及物动词、瞬时与持续动词、状态与动作动词、 助动词、情态动词与连系动词
1. There is someone knocking at/on the door. Who ________ it be?
A) may B) will C) can D) must
1)Police said the accident occurred about 4∶30 p.m．
2)This small tree also occurs in central and southern India．
3)The though of giving up never occurred to me．
occur为不及物动词，“to happen, especially unexpectedly”，如上面例句中的________；“come into sb's mind suddenly”，如上面例句中的________；“to exist or be found somewhere”，如上面例句中的________。
按要求选出相应的单词。
表示动作的及物动词
hide, unite, pretend, extend, book, elegant, origin
___________________
按要求选出相应的单词。
表示动作的及物动词
retire, advantage, guarantee, purchase, score, final, success
_____________________
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