There ______ more than 200,000 overseas domestic servants working in Britain.

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问题 There ______ more than 200,000 overseas domestic servants working in Britain.

选项 A、is estimated to be
B、are estimated being
C、are estimated to be
D、is estimated being

答案C

解析 There be句型题。There be句型可以和动词的被动语态一起使用,常用结构有:There is/are expected to be…(预计……);There is/are known to be...(据人们所知……);There is/are estimated to be...(据估计……)。本题的真实主语为200,000 overseas domestic servants,为复数形式,故C正确。
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