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Expertshavebeenwarning ofthehealthriskscausedbypassi...

欄目: 練習題 / 釋出於: / 人氣:3.19W

問題詳情：

Expertshavebeenwarning ofthehealthriskscausedbypassi...

Experts have been warning of the health risks caused by passive smoking

A. at a time B. at one time C. for some time D. for the time

【回答】

C

解析：本題考查固定短語。從句中have been warning 可知，應用for some time 一段時間，at a time 每次；at one time 曾經。

知識點：固定句型

題型：選擇題

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