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问题: 关于half的英语问题

The number of registered participants in this year's marathon was half _______
Aof last year's
Bthat of last year's
Cof that of last year
怎么做?帮忙讲一下……谢谢!!
A是错的哦~

解答:

The number of registered participants in this year’s marathon was half .   
Aof last year's
Bthat of last year's
Cof that of last year
(前后相比的应该是今年和去年注册参加的人数“the number of”故代替它的应该是单数指示代词“that"表同类对比,答案为B。