I am so tired today. I swam _____ the river in the morning and I walked ____ the forest in the afternoon.A.through, throughB.across, acrossC.across, throughD.through, across
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C解析across 与through的区别在于，前者表示从物体表面穿过，而through表示的是从物体的内部穿过，或某个空间穿过，根据本题的要求，选C