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Thismachineneeds onceayearinordertoworkprope...

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問題詳情：

Thismachineneeds onceayearinordertoworkprope...

This machine needs once a year in order to work properly.

A. to check B. checking C. check D. checked

【回答】

B

知識點：相似相近詞比較

題型：選擇題

Tags：Thismachineneeds

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