答案：B测试点：从句连接词。分析：why引导的从句是名词性从句，可作句

答案：B测试点：从句连接词。分析：why引导的从句是名词性从句，可作句子主语或宾语；但OCCur是不及物动词，后面不接宾语而接状语。why应为when或if根据句意，连接词why词意错误，应改为when，表示时间。

Kết quả (Anh) 1:

Answer: b test points: clauses, conjunctions. Analysis: why before is a noun clause can be used as subject or object of a sentence, but OCCur is an intransitive verb, behind pick up objects and adverbials. Why should be when or if the meaning of the sentence, Word why the meaning of the Word error, and should be replaced when representing time.

Kết quả (Anh) 2:

Answer: B test point: clause conjunctions. Analysis: why clauses introduced a noun clause, the sentence can be as subject or object; but OCCur is intransitive, back and pick adverbial object is not connected. why it should be based on when or if the sentence was intended, conjunctions why meaning of the word wrong, should be replaced when, represents time.

Kết quả (Anh) 3:

The answer: B test point: Clause connection word. Analysis: why guided clause is a noun clause, which can be used as the subject or object of a sentence; but the OCCur is a transitive verb, followed by an adverbial clause. Why should be when or if according to the meaning of the sentence, word meaning why connection error, should be changed to when, that time.