The heating system has recently been______to make it more efficient.

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问题 The heating system has recently been______to make it more efficient.

选项 A、modified
B、changed
C、corrected
D、replaced

答案A

解析句意：“为使供热系统更有效对其进行修缮。”本题考查词义辨析。modify是“修改，更改”，句意的意思，常指修改使其更完善。

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