问题
选择题
They were walking along the shore ________ a huge wave appeared out of nowhere, sweeping
them out to sea.[ ]
A. as
B. while
C. when
D. though
答案
答案：C
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They were walking along the shore ________ a huge wave appeared out of nowhere, sweeping
them out to sea.[ ]
A. as
B. while
C. when
D. though
答案：C