--How did the boss pay the workers?--As a rule, they were paid ______.

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问题 --How did the boss pay the workers?--As a rule, they were paid ______.

选项 A、by an hour
B、by the hour
C、by hour
D、by hours

答案B

解析 by可以用来构成短语作状语表示“按时间、长度、重量、数量等单位计算”的意思。但这个介词短语必须由by+带the的单数词形的有关名词构成,其中the含有“每一,每(per,each)”的意思。
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