More functions of the new machines______ (正在开发完善当中).are being developed and perf

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问题 More functions of the new machines______ (正在开发完善当中).

选项

答案 are being developed and perfected now

解析本题考查被动语态。“正在开发并完善”可译为be being developed and perfected，现在进行时的被动语态表示此时此刻某事正在被做，其中动词be应随主语作相应变化。

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