People think “SOS” is the simplest and commonto make, in time of danger or disaster.A. ma

发布时间：2020-08-30 00:09:37

People think “SOS” is the simplest and mon    to make, in time of danger or disaster.
A. mark
B. sign
C. signal
D. remark

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A. mark
B. sign
(答案→)C. signal
D. remark
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