2. 外语
  3. Sharks were once thought to be instinctive killing machines, but it is now believed______.

Sharks were once thought to be instinctive killing machines, but it is now believed______.

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问题 Sharks were once thought to be instinctive killing machines, but it is now believed______.
选项 A、they learn to hunt by experience
B、learn to hunt by experience
C、learning to hunt by experience
D、that learning to hunt by experience
答案A
解析 The verb is now believed needs a noun structure as its direct object. They learn to hunt by experience is a noun clause with the subordinator that omitted.
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