He was walking along the sands he saw a big footprint in the sand.A. while B. asC. whenD.

发布时间：2020-08-16 23:53:48

He was walking along the sands      he saw a big footprint in the sand.
A. while
B. as
C. when
D. after

网友回答

A. while
B. as
(答案→)C. when
D. after
解析：考查固定句型。固定句型：be doing sth when…正在做某事在这时…（发生了意料之外的事情）；句意：他正在沙地上走着，在这时他看见了一个大脚印。故C正确。
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