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price, cost<-->in front of, in the front of
a number of, the number of a number of许多,谓语动词用复数。the number of…的数目,谓语动词用单数。 A number of visitors came to the meeting. 好几位来宾参加了会议。 A number of cables are needed in this project. 这项工程需要大量电缆。 A number of satellites are now circling the earth. 一些人造卫星现在正环绕地球飞行。 The number of your finger is ten. 你双手手指的总数是10。 The number of students absent is five. 有五名学生缺席。 The number of pigs and poultry has doubled. 生猪和家禽增加了一倍。 The number of phone subscribers increased last month. 上个月电话用户数增加了。
price, cost<-->in front of, in the front of
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