Calculations, which are astronomically exact, have been made________with the use of computers.

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问题 Calculations, which are astronomically exact, have been made________with the use of computers.

选项 A、possible
B、it possible
C、possibly
D、to be possible

答案A

解析 本题考查主语补足语。在主动句中,make:可接复合宾语,即“宾语+宾语补足语”的形式,常见结构是make+宾语+adj. /n. /do/doing/done/介词短语。当句子变成被动语态时。复合宾语中的宾语变成了主语,宾语补足语也随之变成了主语补足语。该句的主动语态是sb. has./have made calculations possible,故答案为A项。
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