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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