问题补充：
The young men walked the forest and came to a big river at last.
A. on
B. over
C. through
D. across
答案：
A. on
B. over
(答案→)C. through
D. across
解析：本题考查介词。through表示从事物内部通过；across表示从事物表面通过。句意：年轻人穿过森林，最后来到一条大河。
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