问题
选择题
He _____ along the seaside _____ a tsunami came. [ ]
A. walked; when
B. is walking; as
C. was walking; when
D. was walking; while
答案
答案：C
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He _____ along the seaside _____ a tsunami came. [ ]
A. walked; when
B. is walking; as
C. was walking; when
D. was walking; while
答案：C