夹心修饰
Until recent times不简洁
the passive is not an error. think about the meaning of this sentence. there are two ideas: 1/ they led a nomadic existence (= how they LIVED THEIR WHOLE LIVES) 2/ they slept in certain types of housing (= how ONE ASPECT OF THEIR LIVES worked) now ask yourself... should #1 modify #2, or should #2 modify #1? the answer should be clear. choice E is backward.
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