I have repeatedly recommended that our social security system _______cover many of the occupations. ( )

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问题 I have repeatedly recommended that our social security system _______cover many of the occupations. ( )

选项 A、being extended
B、extended to
C、had extended to
D、be extended to

答案D

解析动词demand，insist，recommend，require，suggest等引导that分句时，分句中谓语动词通常用原形，又因为分句中主语our social security和谓语动词间是逻辑动宾关系，应用被动语态，所以应选(should)be extended to，其中should通常可省略。答案为D。

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