Don’t all speak at once!______, please.

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问题 Don’t all speak at once!______, please.

选项 A、Each at one time
B、One by one time
C、One for each time
D、One at a time

答案D

解析 一次一个人说。本题考查词组辨析,可扩充为:One person speaks at a time.at a time:每次;一次。A选项中at one time表示“曾经;同时”,因此不符题意。
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