The young men walked the forest and came to a big river at last.A. onB. overC. throughD.

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。