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

考查定語(yǔ)從句。句中where引導(dǎo)定語(yǔ)從句，先行詞為the Arctic north，在從句中作地點(diǎn)狀語(yǔ)；which引導(dǎo)非限定性定語(yǔ)從句，指代前面的事情。故選D。