6.If it _ tomorrow, the opening ceremony would have to be postponed.
A.were to rain
B.rains
C.is raining
D.had rained
正确答案：A
解析：本句为与将来事实相反的虚拟语气：if 主语 + were to do / should do / did，主句用 would/could/might + 动词原形。were to rain 表示可能性较小但可设想的将来事件，最符合语境；rains 是真实条件句，与主句 would have to… 不匹配。
8.The committee _ finding it difficult to agree to each other.
A.are
B.is
C.be
D.was
正确答案：A
解析：committee 在英式英语中常视为复数集合名词，尤其强调其成员个体行为（如 disagreeing）；此处 ‘finding it difficult to agree to each other’ 显然指成员间分歧，故用复数 are；was 是过去时，无时间依据；be 不合语法；is 常见于美式英语，但本题语境倾向英式用法。
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