1选择题
The question ________ we should go on a picnic or not depends on the weather.
- A. that
- B. whether
- C. if
- D. which
答案：B
解析：本题考查名词性从句中主语从句的引导词。句意为“我们是否去野餐这个问题取决于天气。”从句“we should go on a picnic or not”作主语，且句中有“or not”与之搭配，表示“是否”，只能用“whether”引导，不能用“if”。故选B。
2选择题
It is required that every student ________ a mask before entering the classroom.
- A. wears
- B. wear
- C. wore
- D. will wear
答案：B
解析：本题考查虚拟语气。在“It is required/demanded/ordered... that...”结构中，that从句要用“(should) + 动词原形”的虚拟语气。故选B。易错点：学生容易受主句时态影响而误选过去时态。
3选择题
The report ________ by the research team was finally published in a top journal.
- A. writing
- B. to write
- C. written
- D. having written
答案：C
解析：本题考查非谓语动词作定语。句意为“由研究团队撰写的报告最终发表在顶级期刊上。”report与write之间是被动关系，且动作已完成，应用过去分词written作后置定语，相当于which was written。A项writing表主动或进行；B项to write表将来；D项having written是完成式主动，均不符合。故选C。
4选择题
________ the project is finished on time is still uncertain.
- A. If
- B. Whether
- C. That
- D. What
答案：B
解析：本题考查主语从句的引导词。句意为“项目能否按时完成仍不确定。”从句“the project is finished on time”作主语，表示“是否”，且位于句首，只能用Whether引导，不能用If。That引导主语从句时无实义，不表示“是否”；What引导时需在从句中充当成分。故选B。
5选择题
If I ________ you, I would seize the opportunity to study abroad.
答案：C
解析：本题考查虚拟语气在条件状语从句中的应用。表示与现在事实相反的假设，从句用一般过去时（be动词用were），主句用“would/could/might/should + 动词原形”。故选C。易错点：学生可能根据主语I而误选was，但在虚拟语气中，无论主语是什么人称，be动词一律用were。
6填空题
________ (not know) what to do next, he turned to his teacher for advice.
答案：Not knowing
解析：本题考查非谓语动词作状语。句意为“不知道接下来该做什么，他向老师寻求建议。”句子主语he与动词know之间是主动关系，且“不知道”这一状态伴随“寻求建议”这一动作同时发生，应用现在分词形式。否定形式直接在分词前加Not。故填Not knowing。易错点：学生可能忽略分词的否定形式，直接写Knowing。
7填空题
The manager insisted that the new policy ________ (implement) as soon as possible.
答案：(should) be implemented
解析：本题考查虚拟语气。在动词insist（坚持要求）后的宾语从句中，要用“(should) + 动词原形”的虚拟语气。主语policy与动词implement之间是被动关系，故用被动语态be implemented。故填(should) be implemented。易错点：学生容易忽略被动语态，直接写implement。
8填空题
________ (attract) by the beautiful scenery, the tourists decided to stay longer.
答案：Attracted
解析：本题考查非谓语动词作状语。句意为“被美丽的风景所吸引，游客们决定多待一会儿。”句子主语the tourists与动词attract之间是被动关系，且动作已完成，应用过去分词形式。故填Attracted。易错点：学生可能误用现在分词Attracting，忽略被动关系。