All the teachers and students ______ , the ceremony was declared open.

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问题 All the teachers and students ______ , the ceremony was declared open.

选项 A、had arrived
B、arrived
C、having arrived
D、arriving

答案C

解析 该题考查考生对独立结构的掌握。该句中,独立结构All the teaches and students having arrived表示原因。独立结构还可以表示条件,如:Weather permitting,we will go picnicking tomorrow.如果天气好的话,我们明天去野餐。
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