If________, the politician promised to do all he could to promote public welfare.

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问题 If________, the politician promised to do all he could to promote public welfare.

选项 A、elected
B、having been elected
C、was elected
D、to be elected

答案D

解析句意：这位政治家承诺：如果成功当选，他将大力发展公共福利事业：在if引导的真实条件句中，if的谓语动词是“be”或含有“be”，而主语又和主句的主语一致，则从句中的主语可连同动词“be”起省去。在本句中，政治家当选成功属于将来时，所以要用不定式结构来表示，故答案为D。

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