单选题After we walked ______&nb

问题补充：

单选题Afterwewalked______theforest,and______ariver,wearrivedatthatsmallvillage.A.across; acrossB.through; acrossC.across; throughD.through; through

答案：

B解析穿过两边有高度的地方用介词through；穿过广阔的海洋，沙漠，平原用across。