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
I would love ________ to the party last night but I had to work extra hours to finish a report.
Iwouldlove________tothepartylastnightbutIhadtoworkextrahourstofinishareport.
Toaworker,________fromthepointofviewofsocietyisnecessarylaborisfromhisownpointofviewvoluntaryplay.