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[题目示例]The country has already sent up three unmannedspacecraft, the most recent____atthe end of last March.A. has been launchedB. having been launchedC. being launchedD. to be launched【解析】B the most recent having beenlaunched属于独立主格结构,在句中作状语。
[Topic Example] The country has already sent up three unmannedspacecraft, the most recent____atthe end of last March.A. Has been launchedB. Having been launchedC. Being launchedD. To be launched 【解析】 B the most recent has beenlaunched belongs to an independent nominative structure , In the sentence as adverbial.