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一道sat语法题A(Untilit)canbereplacedbyaB(faste一道sat语法题A(Untilit)canbereplacedbyaB(faster),moreefficient,andmoreeconomicalmeansoftransportation,tracksC(willcarrymost)ofthefreightD(withinandthrough)metropoli

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一道sat语法题 A(Until it) can be replaced by a B(faste
一道sat语法题
A(Until it) can be replaced by a B(faster),more efficient,and more economical means of transportation,tracks C(will carry most)of the freight D(within and through) metropolitan areas.为什么选A?C中的carry 是及物动词吗?
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答案和解析
考查单复数.
A中的代词是指代C选项前面的tracks,所以不是IT而是THEY