[单选题]题目35未回答满分1.00未标记标记题目. Dolphins are smart animals. They ________ save people's lives.
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2024-02-03 16:06:25
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[单选题]题目35未回答满分1.00未标记标记题目. Dolphins are smart animals. They ________ save people's lives.

a. can
b. must
c. should
d. need
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