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As a rule, domestic servants doing odd jobs are paid ______.
A．by the hour B．by hourC．by an hour D．by hours
A
by與the連用,可用于表示“以……為標(biāo)準(zhǔn)或單位”。又如：by the week, by the year, by the thousand等。注意：按重量計(jì)應(yīng)表達(dá)為by weight。
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