2. 外语
  3. Ever since human beings have ______ the earth, they have made use of various kinds of tools.

Ever since human beings have ______ the earth, they have made use of various kinds of tools.

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问题 Ever since human beings have ______ the earth, they have made use of various kinds of tools.
选项 A、dwelt
B、inhabited
C、lingered
D、perched
答案B
解析 inhabit意为“居住”，并且是及物动词。dwell的意思也是“居住”，但为不及物动词，常用作dwell on／upon。linger的意思是“逗留”。perch常常表示“栖息”的意思，因此在这种情况下主语应是鸟，而不是人。
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