Question

What would have happened ______as far as the river bank ?

A．Bob had walked farther	B．if Bob should walk farther
C．had Bob walked farther	D．if Bob walked farther

Answer 1

C

考查虚拟语气。根据语境为过去事实相反的虚拟语气，故用had Bob walked farther，等于if Bob had walked farther，选C。