They built a highway _______ the mountains.
D
leadinginto的逻辑主语是highway，它们之间是主动的关系，所以用动名词形式。句意：他们修建了一条通往山里的公路
The traffic was held up for more than thirty minutes, ________ caused me to arrive late.
Peopleappreciate_______withhimbecauseheisknowledgeableandhumorous.
Toaworker,________fromthepointofviewofsocietyisnecessarylaborisfromhisownpointofviewvoluntaryplay.
People appreciate _______ with him because he is knowledgeable and humorous.