问题详情：
A group of middle school students spent two weeks the jungle.
A. trekking through
B. trekking across
C. to trek through
【回答】
选A。考查固定短语及介词。spend. . . doing sth. 花费……做某事。trek through the jungle 穿越丛林。through指从物体的里面穿过, across 指从物体的表面穿过。
知识点：动词和动词短语
题型：选择题
