The Creat Wall winds its way from west to east, ______ deserts, ______ mountains, ______ valleys, till at last it reaches the sea.A.over; across; acrossB.through; past; pastC.across; over; throughD.past; through; over
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C解析沙漠是大片大片的，经过时是从其表面穿过，用across；从山的一边到另一边的翻越用over；山谷是中间低两边高的，从其内部穿过用through。