问题
选择题
There are a great number of natural resources in the desert, which remain to be ________.
A．explored
B．exploited
C．exploded
D．exposed
答案
答案：B
题目分析：考查固定词组。固定词组sth remain doing/to be done某事有待于被做；句意：在世界上有很多的自然资源，他们都有待于被开放利用。故B正确。
点评：固定词组sth remain doing/to be done某事有待于被做；