2012年12月大学英语六级语法专项练习(12)

　66. The chairman threatened ________ if his policies were not adopted.
A) to resign        B) resigning        C) to be resigned        D) being resigned（B）(www．Examw。com)
67. She was able to give the police a full account of since she had been ________ to it.
A) an observer        B) an on-looker        C) a watcher        D) a witness（A）
68. Very few people understood his lecture, the subject of which was very ________.
A) obscure        B) upsetting        C) distant        D) inferior（A）
69. Although the national government has introduced some new laws on this subject, it is the ________ state governments which are responsible for pollution control.
A) precisely        B) primarily        C) progressively        D) preliminarily（B）
70. He would ________ it that his son took a livelier interest in politics.
A) see into        B) see through        C) see about        D) see to（D）

答案：66. B 67. A 68. A 69. B 70. D