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問題詳情:

 Theyarealsoaskingparentstokeepaclosewatchontheirchildr...

 They are also asking parents to keep a close watch on their children, especially during ______ they call the "risky" period: between the middle of the day and sunset.

A. what        B. which     C. that       D. when

【回答】

A

知識點:代詞

題型:選擇題

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