Kitty takes a bus to school every day because it takes less time than( )to sshool原因

问题描述:

Kitty takes a bus to school every day because it takes less time than( )to sshool
原因

应该填:walking
Kitty每天坐公交上学,因为这样比步行去学校省时间.
because后面的it代替的是taking a bus to school这个动词短语.动名词做主语
所以than后面的动词,也要用动名词形式,即walking
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