Question

Canada has vast areas of wilderness, from the Arctic north, _______ average winter temperatures are usually -20 ⁰C, to the border with the USA in the south, _______ is said to be the longest border in the world not defended.

A．which, where

B．whose, which

C．where, where

D．where, which

Answer 1

D

考查定语从句。句中where引导定语从句，先行词为the Arctic north，在从句中作地点状语；which引导非限定性定语从句，指代前面的事情。故选D。